Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f6cb5803ee925e…

MALICIOUS

PDF

83.0 KB Created: 2021-06-28 05:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab7e1fbfac4b9b7111900ade298b1405 SHA-1: d796110f7abc8643e64126f51819c5aa9e8f4076 SHA-256: 87f6cb5803ee925ef9e044c63f5110446827dd358ffe0c1e5af6c88305f05209
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload directories. The presence of numerous links to distinct hosts, many of which are associated with form-plugin uploads, suggests an attempt to distribute malicious content or conduct phishing through these compromised sites. No scripts were extracted, but the overall structure points to a lure for users to click on these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3db87ea3b8---66629356945.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/e3fa22a11c5ac552a7a270e355a2e8f5/49051373731.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/8snfj0a2mhpjgtq9dmjr9ev0hb/60395661661.pdf
    • http://salt17.com/userfiles/files/27532499337.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087371927e11---15373688573.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082704b3eac3---luvuvimipexituzuti.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/617c2v6sgkov6dokm2b5egv7eu/bixudazo.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/5c99a7d35d247673d363854564382c66/89027542366.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160760528e3e3b---faxunonav.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/18164e823d9b80422b7a0685e90c26f7/rexuzaluvekigaxevurujudo.pdf
    • http://csc0532.com/userfiles/file/20210626085648_hlfjai.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ikqi3hc549qj2d38166p0auh93/34203784566.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1644432547---74509841461.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9b07841b2---96828340513.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37ac916e85---gukabogodakutodo.pdf
    • http://houstontca.org/Content/uploads/files/bonagogaselaniramuwolel.pdf
    • http://alliance-ltd.com/userfiles/98910227567.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b76fb3b1d2---58998146243.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/41f1cd645361e40661a984e6e49f6a05/6773585942.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a32a2aef68---93826248569.pdf
    • http://firanywiktoria.pl/uploads/editor/file/zukiluja.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/2953e45bee7e5db537fea2fe3063b498/xaxowudi.pdf
    • https://menu2uplus.com/images/file/fukanola.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/c00a3f08c02e5d67e5ffee67a41f8703/kusalaxofokozub.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=what+is+a+heater+matrix
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e30b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE30B 16792 bytes
font_01_sfnt_off0000fb22.bin
917dcd1b6e2b074fddc16f6b3591dba8ef86979743388aea97fc4fb511e2780e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 10200 bytes
font_02_sfnt_off00011209.bin
72b8bc0dab31f6d95f2e966f1d54fd9c8ddd502d86039af90f50ca9c8164eeda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11209 16672 bytes

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