Malicious PDF — malware analysis report

Static analysis result for SHA-256 50792ce8e6c33f67…

MALICIOUS

PDF

89.2 KB Created: 2021-09-06 23:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3bf86989fe49ffc63d0d845cd6a2960a SHA-1: 06abcfcbfa9c5444b5a68990b6571c0682a130a1 SHA-256: 50792ce8e6c33f6749af82efaaa1b20c33bf287f1ad31830a0e537eb5a0c6ee8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' directly support the link farm and compromised hosting findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://yds-wcv.jp/free_images/files/58292575146.pdf In PDF document text
    • http://msamerica.net/clients/873634/File/kuzuvewugek.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/34139303517.pdfIn PDF document text
    • http://agama-rc.com/upload/files/26765081251.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/8k0u71nbmdk6qjhl4mus11es2b/81164829495.pdfIn PDF document text
    • https://istihdamhaberleri.com/upload/ckfinder/files/guraw.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/18663059684.pdfIn PDF document text
    • http://888chji.com/userfiles/files/sapafaxede.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/53915480473.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/wedudazujogiribima.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd4b69784f---luzajewerideradurosot.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc7727bae---5847052238.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/litikasex.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/nogi8cb4clvcqirc00hseaggj3/kejiromufuwubifoguxi.pdfIn PDF document text
    • http://akssert.com/userfiles/files/xagilokinuze.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/1e6d6fe3019a186ae372e44ef1012bba/woxodumomumukijopagel.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/14662154814.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/hg13gf6jqmrrfd1laikejdo0s3/ruluzopadipusa.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/8835fca9413928b41d356243811b4cb5/busimazobezimuxi.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/pufugumusiloxedawezuj.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/282bf8d585f58709b7cbb6af29735c11/pamafilijunolumavajigof.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca25c829fc---66519519253.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e04f7d663c---33226228789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=prefilled+syringe+manufacturing+process+pdfPDF 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_off0000f62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3E 17988 bytes
SHA-256: 4333c286002923fe9655ed8d64a46ba27c9654ccf6b4f75cf66409737188f26c
font_02_sfnt_off00013cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBB 11180 bytes
SHA-256: 599a69804e9bf440b2a4c21a1877c174c7eda4a5efdc98bd3001695fc3d31ab3

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