Malicious PDF — malware analysis report

Static analysis result for SHA-256 486c1dcbdb957c0d…

MALICIOUS

PDF

89.3 KB Created: 2021-06-30 20:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7b92b62572e8d12224d119c48ad3511e SHA-1: 6e63b430912db986aab15e740aad47c36e771a83 SHA-256: 486c1dcbdb957c0d9877c82467a8c2ed01aa65912684d300c9016999fffc9776
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, which in turn redirect to other URLs. This pattern is indicative of a link farm designed to obscure the ultimate destination, likely a phishing page or malware download. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://synerhu.ru/uplcv?utm_term=use+of+modals+pdf PDF link annotation
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/5fa86354a93ce9b005f838b84426af59/39114776065.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/epun06s8m1lvcjokd0tnq2lg43/supujanesos.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/cdf5c92616c2671ed0e9aaa3eea7b506/xebuv.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a417d84e9bb27924a3eda2efa5d46b00/fopolifetimifizubanodofuz.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/aa66d0dc41d1866f7eed37809c334ec4/45195798852.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/3ede8069e075636ccf3ac09deb34eda4/30722350309.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4f6c9a23c---waxeleden.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/odpt6qpl2m6gbstjtuu2k95ia3/7437701058.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/lepegulutivugepuvozuvas.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/feruwol.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/87505577521.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c878dede69---33587763212.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/a5a29csfh3at4nbii4cja8nijp/vezuradataxi.pdfIn PDF document text
    • http://refta-bg.com/userfiles/file/27017799476.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9c23eaf40---wazele.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/k6k0vo9ac94286m3cbqfev36oc/doruvezomevutufimawob.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/033bba265b32fbf39e758b75cdb42dbd/noxotuvewopebevitanu.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16097ce274ad80---86840550520.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daa62b05ee8---79373022020.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/gunos.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/6uoo1it6qae4bbr4b6nimv43c0/jadudegunumugutikaga.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad280ac066---50092073283.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79f8ff1e66---zokarelebud.pdfIn PDF document text
    • 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_off0000fafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11310 17172 bytes
SHA-256: 483cb777cc8d307f1badffdc460093970035ea451a0764cb873e9688b9994104
font_02_sfnt_off00013feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEB 10272 bytes
SHA-256: 5a727e245464ab14397d6ebb7bcc08be5b67604425c6ed78439cafc6cf31cdc4

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