Malicious PDF — malware analysis report

Static analysis result for SHA-256 6833e7e2685467b9…

MALICIOUS

PDF

92.2 KB Created: 2021-07-25 11:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 237995cbb5fbadb72384bd3d1f2c5eda SHA-1: e4bea8360da0b52f6f6162f04bb5b68d9b4c6966 SHA-256: 6833e7e2685467b9f99dfcdce4c5f85849efc3f7c0d3ccac46779a1ec5c1d485
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the PDF functions as a link farm, with many embedded URLs pointing to compromised WordPress upload directories. These links likely serve to redirect users to malicious content or phishing sites, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

Heuristics 6

  • 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.
  • 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.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bece4527bf---85244772979.pdf In PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700e56ea655---50016352858.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/e11744955c3973c5f5e4613c8d1f66f3/jexabut.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/741899232.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/hqafpfqi5qrnka6hh048ot3f47/51935043912.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/94a9557aaf9ebe3c83e427585040bb74/25459557104.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/28982642741.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/87237332038.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/bedc39af925630b38329ee33baa3be75/fewukepob.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/siwewekivixanisukovetukus.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/8425a1c529f1cfbece42a2259ffafb1a/zejuxawugebulaxu.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/gonemomeluzaboxinuredeve.pdfIn PDF document text
    • http://phsclassof1970.com/clients/875774/File/71004809186.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/71624749941.pdfIn PDF document text
    • http://skisun.it/userfiles/files/sunoliditariguruviwis.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e68a7c8fe49---vorunafepi.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/d3kggqfs18mlsqteea7n229fl4/96658025225.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078be27f0c10---60961754071.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8be73ac4d---75684243146.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/kulosibirazirofir.pdfIn PDF document text
    • https://sca-kc.org/scauserfiles/files/64515034035.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/senaluno.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/pedupefimovekakuvedigezit.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/62370870074.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/41409221616.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090a994d2bde---77912420608.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/64297850222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=trigonometry+multiple+choice+questions+and+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001023d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023D 11372 bytes
SHA-256: 56aa2d8edffc08596d868f3530470655100325089e876b1bcd724e94b6560a3c
font_02_sfnt_off00011c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C59 18204 bytes
SHA-256: b721cb96a4980fbee2968295d055d31a714cc7ed9a6e773644e92d5d6ff1092a
font_03_sfnt_off00014cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CEA 16144 bytes
SHA-256: 1bb543891201b86cb218c82ce0c1e431878b85d3145a79f40ea94bf38162e691

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