Malicious PDF — malware analysis report

Static analysis result for SHA-256 2871b4529c4e0102…

MALICIOUS

PDF

74.7 KB Created: 2021-10-04 13:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b6b993821d0d76d84e43015002978276 SHA-1: eb41bb7b9d1491bbc3c9218f1c64046c952e14ad SHA-256: 2871b4529c4e01021bd8445867c15e6a20b3fdfc1abcb9f0ca0803013a691f21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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 https://crewmak.ru/uplcv?utm_term=top+free+car+games+for+pc PDF link annotation
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/95101002926.pdfIn PDF document text
    • https://aneri12.cz/res/file/47911805352.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/73916543507.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/ruxanofomiw.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/22741576286.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/kerijo.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/82615462033.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/rowusixedomabutilumoru.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/86730699434.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c3d4d7b1e---wikefegirowewili.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/33397741804.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139f8a0e9230---nedidulusolivu.pdfIn PDF document text
    • http://thesei.com/In PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/80796606143.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/99962480388.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/gijuvametavekupo.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/xedorodobotaf.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/99604861037.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/xalogokoru.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/1406445f65c9b156d7587f28b06f2e7a/40421014427.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/rejiserab.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614f3e3d40a28---37271222802.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/dasorubanoniniwerotol.pdfIn PDF document text
    • 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_off0000bf3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3E 10444 bytes
SHA-256: 7efdf3686d2b4d2e3a539dab8ca4ded745b1f76f04fe1535bffd02c765105af3
font_01_sfnt_off0000d6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FB 17956 bytes
SHA-256: 3eb090713059863bdb9c53aab9b0ec071d1dabfda6406e98d582f28fc8a11cc7
font_02_sfnt_off00010531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1