Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f87a7a64caae7ff…

MALICIOUS

PDF

82.5 KB Created: 2021-09-03 04:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0698d22208a3724972443470f08f595d SHA-1: 969a2523de67947a9d019cf6b8bf1ccc5a0a0e13 SHA-256: 1f87a7a64caae7ff89ed311a4fd9ee23b7f7091cfb60aa9022b5e33d0a3b321f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or scam campaign. The embedded URLs are likely intended to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=articles+on+target+costing+pdf PDF link annotation
    • https://presentkompaniet.com/img/content/file/43603674869.pdfIn PDF document text
    • http://onlinevay.com/upload/files/47187664939.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/nibanupo.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/felefusufegegiwe.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a735b90776---49294244293.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/01a922f68de762969f0b546ce123088c/zegixexutokupovunobojose.pdfIn PDF document text
    • http://askort.pl/Upload/file/7026486631.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/e3681c03a2e185d989a6ee15b5798d2c/24929209272.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f3c58da64---67972054255.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/83038853006.pdfIn PDF document text
    • http://tecumseh1962.com/clients/85183/File/41727871005.pdfIn PDF document text
    • http://ailizia.com/userfiles/15897349700.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/1988499172.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/sadekiguropojokasipi.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/9c620c9c97b9c47450a92289949e8896/15602793033.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/80b4pn0bbstrmim90b5fsgpth4/wipomozaxipo.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd3ff71fe1---rimatomon.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff49a3f486---19643973706.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae11e276877---vufuzigutilimenaw.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/55053779251.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/mrqmkl0317tqpmf9mec56k1qrj/94061768804.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/34927656252.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087d56b48dee---17287512075.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/wazotuzoxikukulawezizi.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/0b904bed4250311ef8f1d7c412896aca/zafagizabejasuvow.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_off0000dece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E5 10776 bytes
SHA-256: 964b6a7558a262ff1310097af43844886ab8a87999c9b8a8f230b02d06a96fcb
font_02_sfnt_off00010f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9D 17340 bytes
SHA-256: d61acec6e8438b1aceca19227578753f8927cf2acdd1539fd22fe445b0f94670

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