Malicious PDF — malware analysis report

Static analysis result for SHA-256 00b4ee3f4bcff9a1…

MALICIOUS

PDF

78.6 KB Created: 2021-06-13 16:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02984117077b4c659bc130ce96ff787b SHA-1: 00bad4cdad623f46c76df36a8072db5b2fe061bd SHA-256: 00b4ee3f4bcff9a1ac7bb1e0d7ca41aead255c7a67529ce98933f749d1b14247
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The embedded content, though heavily obfuscated, appears to be related to 'Android phone screen recording app', likely a pretext to drive traffic to malicious sites for further exploitation or credential harvesting.

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://coretry.ru/uplcv?utm_term=android+phone+screen+recording+app
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa2a3f295f---71852671651.pdf
    • http://nakatka.com/files/file/mugul.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/bc05a11a65731611cec1e96c2c56e92a/soxerawanitawuvajimuxin.pdf
    • https://ferado.vn/userfiles/file/rodowovapopu.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7e2b68783dc95a6279ede14b1197f8d7/guperidafewomalabovawenid.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f111f1cb6---sewenepixoforavuvoniva.pdf
    • https://aarhuskortet.dk/images/file/witulenipuxedobujipiwosor.pdf
    • http://kapelski.pl/userfiles/file/meviposulupizo.pdf
    • http://sotel-perm.ru/site/file/reperoruxox.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160acb03e38f07---6737564752.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c28de388565---zogumixetagatedox.pdf
    • http://knshzj.com/CKEdit/upload/files/95399657354.pdf
    • http://supermarketdv.ru/files/file/88712881448.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/fb653a959f2148fb558411e9504e11a1/21580202782.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/1d3df5313cb019c62158be1e325a6caf/gubifaze.pdf
    • https://amblamy.ee/upload/file/66026125260.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f79d.bin
bbde1dfa12e4b2ad6a978f125f2d68dbcee00e3e682cb4426a3de4ab29faa4aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF79D 5292 bytes
font_01_sfnt_off0001099a.bin
436466e4cc6d9c62c51ca1e0f20cd18405b26471d476cb39b51b89777718c667		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1099A 10680 bytes

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