Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec38a8494db31864…

MALICIOUS

PDF

86.5 KB Created: 2021-06-28 23:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f02d5e1dea6e9747154a58b8c5ca2d43 SHA-1: bff37a45ade2b5b5ed35b5eba5ef930163694cba SHA-256: ec38a8494db318646c8701e4a47c6442aa81a8c0e70428d1ffa765eda6bbafc7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to lure users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports its role in distributing links across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=can+i+cut+my+dog%27s+nails+with+regular+clippers PDF link annotation
    • http://copy2d.com/ftp/image/file/59449703358.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c720a77ff---zupadufuzanoxonugor.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/3278np850vtq1hf245g72vbu75/63556489495.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/simiwoj.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/bobovasunepen.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/314a150907ed40560defa14e96872bcd/86003747432.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ee5f7c405---54942980449.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/fimunodironalowibemegu.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/2a192e3af4d5dbb4352fb88d9a2642ed/34683475011.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/21476793934.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/94747064673.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/5hkjovvpd1rejq6v01mkch6j8d/xosanavajefox.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/48174027670.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac13b56893---lejuru.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/58663075630.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/84d90ef438380d67d299aa422714e670/66203236101.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/73942240760.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088293408d2f---63522576403.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/ab245c1b8881de3b1b0fccadf667672c/papubezukimi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qhk9qq44opnimjep7h91af3ig1/nawejirivadurubu.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607581152f639---pajejabusunilug.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/lagewurizuraraje.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/nonadafezitopubilirox.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/90869191982.pdfIn PDF document text
    • http://chromavials.com/d/files/sawilixisudewabofiri.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_off0000ed62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED62 11328 bytes
SHA-256: 5a4ce567b1d1affefcf7a5d2db134d8da963242d8f150e7106b60c0361ebb8f1
font_01_sfnt_off000107c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD5 16992 bytes
SHA-256: ee3506c40e4f4c71bfb25209d61c19e6cc77d068ff34e063a14e63a1acd8cfc1