Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c4c687a6f872a5…

MALICIOUS

PDF

92.5 KB Created: 2021-06-28 00:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: aff8b25f3741e38430570ab05e58a784 SHA-1: 29b6d27f6844594a483425965afdda3a57903e12 SHA-256: 26c4c687a6f872a5f8b12f7d515b6c55f62b7b8ef2bfa20de142ebd66bb6cc08
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. The document body is unreadable, but the presence of multiple distinct hosts and the nature of the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f672c5c7a0---vivujatipininolida.pdf In PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/nrpicv8hppr76gl1orhhrdqs59/debipofizododoze.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/10djlcucn1njq7j3i1ct6pk2d7/kafumisuzuveveje.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/83174351125.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/5f96ebadc96a2162ca48bffebd8be3af/xudemozezalasuxojosi.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf213572c---40679288854.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160964c6287d31---xukadelawufuguse.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/ftn20mh3vc2tcok8n40c9b4ea9/mimenamuwopajiwiv.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/bimasajabebafafipisala.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/72614344317.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a39d2c40cf6---21076195401.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2daaaa3127---vepazutarerizegejajitej.pdfIn PDF document text
    • http://www.bash.cl/media/file/72018068790.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608675998a15b---28385649753.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7677671140---nasebepidimorufigimur.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/abb2de4d7569c76ae199fa131f1e22f2/nipatafilibuvudixujijifud.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9fb646189---leperabe.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/9444f436a77c45f79906bfe57a47bda0/15939760584.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/7leg306mncekohad4j0668k0oa/kakiximuva.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d851d5a5da1304f279baa0e6f5229d9f/38129679338.pdfIn PDF document text
    • http://nensi.si/upload/file/61904511912.pdfIn PDF document text
    • http://tfforming.ru/d/files/26729539885.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pokemon+mystery+dungeon+dx+buried+relic+mewPDF 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_off00010909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10909 11184 bytes
SHA-256: ddd44ecb7fec5303ef50d177c1f9ec39b04131dd0405b0cce2cda68e3b1aaa9f
font_01_sfnt_off00012315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12315 16148 bytes
SHA-256: 81a1c182d2cee2d5a2e3494d34d8ac155c24b2452faec0af07cf67526a898ef2
font_02_sfnt_off00014cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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