Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d02801cfc0caa9…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 03:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b0f02c6df19bf57be5b8f35675a79aa SHA-1: 3b8e1dcd3b1c42a8d7217aaad142c2253cf1e324 SHA-256: d6d02801cfc0caa9834ebf870b943359f929518c08d810c55ec538d4e6cb0be4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of ClamAV detection and ML classifier flagging further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of phishing or malware distribution attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=extended+reporting+period PDF link annotation
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/32895251507.pdfIn PDF document text
    • http://geobrofab.com/clients/d/da/da7cd3953015cd63472398095fc1fcdd/File/towedumirug.pdfIn PDF document text
    • http://sequoia59.com/clients/867919/File/75900519658.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/73102936155.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1320ae5a54---82142477500.pdfIn PDF document text
    • http://healthywithhart.com/res/file/30668763684.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f40c07388e6---kedaramuxub.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608649fc29a3c---powam.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc360392d57---40751652262.pdfIn PDF document text
    • http://markone-tools.com/upload/files/37583444307.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/n4186to5pak11smu3km0720lkp/76662645600.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021081215034173499.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/1503504105.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/zisosiwoxibegerotuva.pdfIn PDF document text
    • https://armenia4d.com/contents//files/3896630304.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/84e583dfcd50e894224934f8c28eec3d/60676741935.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609650f445305---18567330604.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/af81ca2a296cca88c41e81cd93842ef1/15867273148.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d475352b679---virebalivexuzo.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/99099726241.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/69581070730.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/zoturizafinigexufipalot.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a8aa41d5f1b---86570247042.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/36788388317.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_off0000dba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA0 10276 bytes
SHA-256: eacd0b1f25b98e09611b2cd07db818d8c188e19c01be2f98603f4dffca7260f9
font_01_sfnt_off0000f292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF292 18236 bytes
SHA-256: 0ae866a503df6d8c9490ec2d84ddd0f522133ab6ef204e1c8d4372edefbd31d1
font_02_sfnt_off000121f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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