Malicious PDF — malware analysis report

Static analysis result for SHA-256 f548d13c183bb208…

MALICIOUS

PDF

78.7 KB Created: 2021-09-07 23:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 57dfaf39bac5188c94e38bf5710e39b2 SHA-1: 28f75e0e29db7613879bdaf67e1f6735ece65098 SHA-256: f548d13c183bb208182166204b03bce58657eb3fb8f47e1d211012895b2220b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The PDF structure itself is heavily obfuscated, and while no scripts were explicitly extracted, the presence of external links and the nature of the heuristics strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b115952e458---13681088439.pdf In PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/71781222744.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/mhlefg926kfpd1cg4hrsv5d8r5/kopakixexarodokiluse.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc8c0b0019---xotosufuto.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/wutow.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/37320809077.pdfIn PDF document text
    • http://biomehl.com/images/content/files/76046419642.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077803e83b89---74618542366.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/40682292448.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/futagemita.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/porararefora.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/64102530170.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/86386828077.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/wumexuj.pdfIn PDF document text
    • https://rjpexport.com/files/vomadosamofewez.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/3e50cd525de1d1839d4ca3e399efa661/97991943915.pdfIn PDF document text
    • https://magnificenttreks.com/userfiles/file/fedep.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/bovejabojawemejima.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/sb8cdjrupob9h0guhl2gtaoadq/55525135672.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/ladawit.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/5d901eedb09f5a108a32492a3fe9d18a/30358737950.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf7844dd51---41944229748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+do+i+compress+pdf+files+on+macPDF 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_off0000d118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD118 16856 bytes
SHA-256: d8e1403ec3964c86ad1089f50705982feac595034eb6fd0edde40bf1a3ac40a9
font_01_sfnt_off0000fc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7A 10760 bytes
SHA-256: 3cb28235f76888934b623be9352ba178ebfc521ef75251782eee0f0b58a5b4ec
font_02_sfnt_off0001152c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.