Malicious PDF — malware analysis report

Static analysis result for SHA-256 3136276b0187fb03…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 14:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ac8fa70e6726d2829a8fbc8bcaab54d4 SHA-1: 67d61424679f0a815b28cfb5cd624a46f70b301b SHA-256: 3136276b0187fb03d41c990f15907c09ed004fbc8d131cb12dbfc0889b818fba
156 Risk Score

Malware Insights

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

The PDF contains a large number of 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 distribution. No scripts were extracted, so the primary attack vector appears to be the exploitation of user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://stellamaris.cz/userfiles/44458307344.pdf In PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/72158979228.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/xomukopomizuge.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096710fe7fbf---tadupurebopewufod.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853bf4e3d48---77958232983.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/f2hokte6hq7u1e3kcrg84ho487/55319596746.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/04dc62ab02537d692559b8645b4ff9cd/gigoma.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/6193750603.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/052015177744.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202168032187220.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a5575d8cf---fonuz.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/wepisawogufilumaxor.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sofafan.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/gagatoxurigevaj.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3c828f340---jesonebamipobena.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/5jjl6beph84m17cah4cqab3gm2/sutobugixukimofogowerikij.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/58918631297.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/73068782073.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/6095531665.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608090b33abc4---koxuseg.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/vekabariposav.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611865e5f3c15---rizenexufuzosadowek.pdfIn PDF document text
    • http://dejede.com/userfiles/file/81297171476.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/jofuvutimovutenukadibar.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/rujugeguwa.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/22774525480.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=yoga+vasistha+hrudayam+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_off0000cc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4F 20824 bytes
SHA-256: ee728ae219af1a19b81d695b085718d3c8ee7e4fa1ece6a68591e45e9108c20d
font_01_sfnt_off0001031c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B33 10928 bytes
SHA-256: a57768fc12c917216e3ff73bc38352c1ef3c2cad34ae5e238b14a63b382fda55

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