Malicious PDF — malware analysis report

Static analysis result for SHA-256 2948cc3c5b4f46a2…

MALICIOUS

PDF

89.4 KB Created: 2021-07-29 17:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1854338c0024b2b523ec9deb4dfea3f8 SHA-1: 76678a6e33cc3dbeec94ed5c696648bd4d9a91a3 SHA-256: 2948cc3c5b4f46a24723dfa4c2e1713a1ca294d594a49181c5d37d2609e932dc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by a ML classifier and ClamAV, and exhibits characteristics of a callback phishing lure. It contains numerous links to compromised WordPress upload directories, suggesting it is part of a link farm designed to host malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to deceive the user into performing an action, likely related to a fake support or billing issue.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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) or Microsoft license-boilerplate 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 http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160708d0164c9e---27028384912.pdf In PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072440a05ea3---febip.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/sozupodexegusoxef.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ee354817500---63517084191.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/98490874001.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fc50be17706---83547280235.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/a742e62a33dbd83ca9b5f75b9bf1f077/pasigasoxiravowobudag.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b740325f62c---jesivorabepinakanunik.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a034590051a---98524699148.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/de5e6a13048cbd86d22d334a4b5adc5d/fikugosivaf.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210629_123759.pdfIn PDF document text
    • https://koratspring.com/upload/file/90271994072.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/c8025a4309288bad533097d8da29534e/gozukubamulelivofege.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607257dd40697---karibexaxugufakisosev.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/2ed41d9c89a4b1a703ebd64c73cbad58/30046467736.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b033c1f00---58731807998.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/6936aabdfe49d36665d3c64021fba988/tewemakinonalurifala.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/16216901259.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/ec2ab3d2192f18e5b11e328908374715/43575885553.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/jexiguvixozugul.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/newadomofetewixowakad.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/5396251838.pdfIn PDF document text
    • http://alptw.com/images/files/25458652678.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/90646840811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+pair+bose+700+headphones+to+samsung+tvPDF 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_off0000f759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF759 17380 bytes
SHA-256: b5133130c3b8b2280b5ab5fc3cdc214c76ae902158a36b6aadbcd56f68fa2ffc
font_01_sfnt_off000124b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC8 11348 bytes
SHA-256: 44ba6baa26d58acd6749d6c7476fb0494b1299afde21aab22ed135dfc621b56b

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