Malicious PDF — malware analysis report

Static analysis result for SHA-256 0852eacac3481330…

MALICIOUS

PDF

84.7 KB Created: 2021-07-03 09:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 29f143da9b675e0965c3a0ded0b6babf SHA-1: 33f21a92068f9a5bbb8065d37191b007fc93167a SHA-256: 0852eacac3481330560b564e79aa686bbff76722e6ae27f8f0348185ec0bf664
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a ClickFix social engineering attack and brand-impersonation credential phishing. It contains multiple links to compromised WordPress sites and disposable hosting, likely serving as a lure to download a second-stage payload. The document body is heavily obfuscated, preventing detailed analysis of its specific actions, but the presence of embedded URLs and the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=kms+auto+activator+for+windows+10.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4f5fef8cf099f800a70b45cd0e5f2478/65481301876.pdf In PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/cssta4valc6clqeis5ogm5ftvk/rijukumulovugarako.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/b0omvc7m04qui5c5dao5l4ngm8/vuridazikuwituwaledulufo.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/1mhdrn6eonpbih5r6soi92fivm/69291386252.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16089f414940bb---92789712976.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/34913206304.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/lofevazuxe.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2a5a5560ac4de9a9e20954c3fdc6b311/tapowuneju.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0a0707fc5---72392297910.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/32966807832.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/304df083c5b8bd74366793bb6dfe6da1/gewunufojunawerolilafa.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160805a0375f09---karalujeg.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/egb65mho2pjmehgtq4k62fl11i/13290960883.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/7cd1917b244761552259d575fcfa6f0e/71851655373.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/83860805589.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910a465ab57---3329971918.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608abebbf3ad4---wisamevuvemorov.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609041e71d236---62867881728.pdfIn PDF document text
    • http://emaaravm.net/upload/files/gekugeme.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/gixoril.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/14731227738.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609282a59a549---94048000046.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/tempene5q9cvt96opkdnffmhuh/nokezadivubowavuvomufajor.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/decb6b2d79fbaaf4abb692731a6d0648/sivusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=kms+auto+activator+for+windows+10PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C4 16940 bytes
SHA-256: 9ec3a1d9a9b5500e622318d77efbb81544e8bd4161025beb56d5e474e6a90a65
font_01_sfnt_off00011429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11429 10876 bytes
SHA-256: 2c95c2a5414b015aab99957ec544b67a64390e5bbbc2bca7753ac0bd00ab8327
font_02_sfnt_off00012d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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