Malicious PDF — malware analysis report

Static analysis result for SHA-256 46169e1637808a67…

MALICIOUS

PDF

74.5 KB Created: 2021-09-11 08:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a32dadd8f40f700fc1beececae527a86 SHA-1: e1a0d8ec16826b13415ea47e80b14aa6e96f8391 SHA-256: 46169e1637808a67466e6fd053463ca2f5aff71b96f547f5bc6afd8a38b154ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to compromised WordPress sites and other disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=chat+heads+meaning
    • http://hp-cnc.de/uploads/files/73519192733.pdf
    • http://archiw.gbpopatowiec.pl/img/upload/files/dowuvaki.pdf
    • https://mami-m.com/Uploads/userfiles/files/93484223653.pdf
    • https://securitydm.eu/slicice/file/65726260866.pdf
    • https://houstoncoinshow.org/FCKeditor/file/77526665200.pdf
    • http://birkhoffhi.com/userfiles/files/45409633334.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hr12ef83rk5st5jkq57qbl4k86/wojififilanojadaxuwaxot.pdf
    • http://asavn.vn/uploads/userfiles/files/27674849383.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/lqu6u05f2shq9ert78dmn7am96/bodowobumiwevos.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bccdfc1ea6---fukujavaforiwemovu.pdf
    • https://vietnaminsight.biz/ckfinder/userfiles/files/78190072595.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/2b74d5ab92c22f93fd904feac1e17978/58839549364.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/9a71be22122c82cf8ce75806aa0592d1/pededujigunu.pdf
    • http://nuovojob.com/userfiles/files/34017692598.pdf
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/51872621317.pdf
    • http://monteconsultants.com/image/upload/File/dawipefijuv.pdf
    • http://atol-res.pl/uploads/file/wirarokujilijopu.pdf
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/luxitadobazunaxur.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/sikljsr8qa1tnme2u9ja3s2hpd/29843443606.pdf
    • https://macauroommate.com/ckfinder/userfiles/files/subakosotarivaxabowadaxas.pdf
    • https://miraclechuppahs.com/userfiles/file/33008831923.pdf
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/67588325874.pdf
    • https://xn--b8qxb801j.tw/upload/files/raronujekor.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c04a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC04A 16792 bytes
font_01_sfnt_off0000d85c.bin
5f272e1d4cc6a0a9a1de6ae1f8400d468130e034356d3449fba78d9e225e11b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD85C 17236 bytes
font_02_sfnt_off000104fc.bin
fd7a87dcf442407470cd3cf75319dc31bc15109e69093c645ae2c0ffde7efdd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x104FC 10460 bytes