Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb35378ef4f7791f…

MALICIOUS

PDF

91.4 KB Created: 2021-08-17 10:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4c2f9fa70b5e7591116b53de000aedfe SHA-1: 0f64935c3ae62ce16fb3aed163d6419ba07ecb6f SHA-256: bb35378ef4f7791f2eae3a2a452ae98b50742e13a987e3517f9cf85496f2f612
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and other domains, likely intended to lure users to phishing pages or download further malware. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/3d1f8463b2fd48f9979c4ae855d106cd/lojufid.pdf In PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/12581059278.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/kavefenowumetuninuse.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/84386613231.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b17488e5f---rulurebesovox.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/7r5k1ee4t3983h1behsp2177hp/39830660105.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6cf1025d8941ac9d26c55655b726b56e/79207198462.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/35ec6bb26e0d95a61fe493a9a5bdb759/33922252074.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/d737b1c53e70d74979d9f87581a7a0c4/93997031018.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b2aac573949---54217476417.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb09f1cbc9---13532723225.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/59432553404.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/7694264177.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/ragunewuruzoxuk.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a074da42f8---binesonanawerod.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c4e8fc816581a7ee33a3340b072734a9/vegigilobakoralekejodafe.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607aff183597d---51443547215.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/25f3315e92ddfc82f9be75004ded709c/nejozogijobakaxi.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/mutiga.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/jotiletuzodarewe.pdfIn PDF document text
    • http://laduses.nl/image/file/kejobik.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/82644957826.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/36914198758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=hack+para+free+fire+auto+headshot+2020PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B8 10992 bytes
SHA-256: 4dfa198643128f367641a321d623943b82eaff8048cc1b12029063c348220395
font_01_sfnt_off0000ff73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11785 18740 bytes
SHA-256: 52be48ac9cff4be88d594da179f13298d91867abfc0e64d5b4e405a168e6b223
font_03_sfnt_off000146c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C4 16332 bytes
SHA-256: 51b954477a5d96176ab76b9eb18513c29524e390d77daf1ef122752d528e174a

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