Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a3e58b907abfee…

MALICIOUS

PDF

79.5 KB Created: 2021-09-10 15:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d05f502470ed885a2e335ca6eb8f2f0 SHA-1: 6060da0a9a58c7aa533038343df481c7fd3b3e36 SHA-256: 36a3e58b907abfee6bb69fd16ac9c12a8b69d576b4d040bcd03418ba26967ddd
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hamasataccessories.com/userfiles/files/51208399029.pdf In PDF document text
    • http://giteduguedesboires.com/userfiles/file/13844630091.pdfIn PDF document text
    • http://lrpharmaceutical.com/upload/files/4913575516.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613316b4bea66---gisalibox.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/zexasudogewedaw.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210910125333.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/55250224709.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/kujurivametiregulusuxo.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/56784770809.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/19580ed8b68a33543dedd349a5e89669/vemurepugotava.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613697f6646f8---zobobigalaxunagifamikeka.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/e478759682b2ce84e7912754b583276f/53717030899.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/89088412985.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/62372915432.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/6ao3e2eumrr2eah1a6agbepkj6/bejikuxaxabefejajigobite.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/tikujodepijududelebig.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff78c67ec3---90479416692.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/161369b99f1626---41552103847.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/jurenu.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/bizilutavidumeme.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/segogola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=live+net+tv+app+download+for+android+latest+versionPDF 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_off0000d41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC31 10600 bytes
SHA-256: a33626e884344ee912000e5662bdc746371098a3c5eb502c00cda0f9d7be8d30
font_02_sfnt_off0001048f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048F 16992 bytes
SHA-256: 06e446bb1579b0fbd96a0bba5dddb53fb752fbb1369e314a1d889af8574ff705

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