Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c32d661e4533c1a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 21:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 082fc9dc47f683a38e44cc937b3b682a SHA-1: 1efb1a0f62375d0e5a1499f447b902710a010da7 SHA-256: 3c32d661e4533c1afc31ebf8615f978dac8429a0bd7b33183068a41358d322ed
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. It contains numerous links to compromised WordPress upload directories, suggesting it's part of a link farm designed to host and distribute further malicious content. The presence of invoice and callback lures indicates a social engineering attempt to trick users into interacting with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607235c2b9c36---javuzuwininuzorife.pdf In PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945bc396b4f---4873667051.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/tejatudokemuzifijavujod.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9e2f62498---77215389468.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aff9e6147a4---52068951603.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161263c74a4a02---rijameruta.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/12668438255.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e95fe2e0bd---77833238294.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f724f04175---xolomivavabapoxoz.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/4c023d15ff4a5d1437369da30e58d9e5/fexuwujexutimuzivad.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/32092977978.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/84467398153.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/92072884749.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/a4bcfb130077b6a061e545528905636f/20519777504.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/segonif.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/vilaxoreguwizo.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/17600965480.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/96651499102.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/b39a5280c16d46777f7bf2dff752d07c/zitufazikovolusuxumuxivuz.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/74181577249.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac099c8659---zutopukipunofurisekal.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/65598221724.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/1305692619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=secure+pipit+500+manualPDF 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_off0000d855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD855 19676 bytes
SHA-256: b90cd187d30412df8779e43050c243863e621dff42061238fb5a9a03347f31bc
font_01_sfnt_off00010aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12306 10680 bytes
SHA-256: 81ca511eef28f4f466ec207d799e7a828230666df73cfb2747eadf3ed64d705f