Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a33b92aee6f5888…

MALICIOUS

PDF

72.7 KB Created: 2021-06-08 08:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 10c07ee70a9222a89715f7b19b590174 SHA-1: cc509152ae12d4b0c4d545549e4fab0c1e490656 SHA-256: 9a33b92aee6f58886248ab17d5b8a0516d7059802fec6226d43913f691523ed0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded URLs and heuristic firings suggest a link farm hosted on compromised WordPress sites, likely serving as a lure for phishing or malware downloads. The document's content, though heavily obfuscated, appears to reference 'Android windows xp 7 launcher apk', reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/uplcv?utm_term=android+windows+xp+7+launcher+apk PDF link annotation
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d17983aa76---86443699215.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/5af2ccff0502677f6bb44d54685277d5/55072694906.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bedd3e48e91---fuberoronedoxakujubeto.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/mqa20icgtgjhhh1br0lc99tsfp/diguk.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd476861a9---31708075995.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/533ooqs52vislte65vddm54oev/pedofiju.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dc9a3414f98f6cddde385e53cdcc0134/5883421665.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8a29660acd9d6f82e47d76150936d462/8923571961.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/pucbg80te09c0j6jsngisfuq2d/dopoxasoxokef.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/62825895416.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c98495cd7---vasenamurasixunuta.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/9888790941.pdfIn PDF document text
    • http://dnepropress.net/files/file/zenudabuw.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/12a6d020e0c3614d1bb903fa991e9732/logiponi.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/20ff7c0f7146efdab134e6fb33a702bc/21977482267.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081915883871---rogodirozoxibe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC8 5456 bytes
SHA-256: 8de382a7215b220a9795f064f383507d52410adf2aa70881aeca4d0ef832364d
font_01_sfnt_off0000f26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26B 10332 bytes
SHA-256: ea1a02332e6980ad3cb8ea65e03465a024113d3c84caf051eaeb3c876255190f