Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8c91e0df3c376b…

MALICIOUS

PDF

78.2 KB Created: 2021-06-14 12:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0241f02c8c9da284587514216566b2f9 SHA-1: e6262638ec3a320bd229315ae087a185e513b90b SHA-256: 3b8c91e0df3c376b1a4f093bb1f7c8401b95f781f035ae461b5e265e51bb03db
156 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised WordPress sites and potentially malicious download URLs, such as the one for 'Gb whatsapp pro'. The primary goal appears to be phishing or distributing malware through these deceptive links.

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://catamma.ru/uplcv?utm_term=gb+whatsapp+pro+v8+30+apk+download
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/bd692929abbdd385952c41436e06d515/95572583600.pdf
    • http://agendatourvietnam.com/hinhanh/file/8950043552.pdf
    • https://artasedanasingaraja.com/uploadfck/file/16386568046.pdf
    • http://radissonhoteltraining.com/userfiles/file/girarogutajuxiwug.pdf
    • http://amphorabeautyclub.com/campannas/file/xukufuxozelejelata.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f6e2b8dad---nafawurogidexogelu.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/3b628175a56acf6476cbff29aa66f29f/52605132597.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/nutog.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/batujurova.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/bfjhrrkdelid3re85ngq4l5d21/97086947761.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/8ik37fr9ruvsiv6emh44gm1v86/21469121426.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/rlkr25f54m4vij5n9athn4c234/67302586896.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4463087630---wuvenalalapofiru.pdf
    • http://vyveva.eu/UserFiles/File/nulewotexirakusukewisilem.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/dbfad7a3f317c7ff8d0c8b30a167af01/6330148908.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/bb1e48c3d9d88c83a791b8c7d3d78cf1/82680280780.pdf
    • https://spacio.hk/attachment/file/69138153153.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_off0000e67b.bin
a9eba5a54cd87fe60e267b09d8470ab5f4573ab0fd4cab68426f2b12a47a6da3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE67B 5936 bytes
font_01_sfnt_off0000fab5.bin
0227004277de5e427d119afedf06af0f3d7332a11abd84403c030915644ea120		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB5 15124 bytes

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