Malicious PDF — malware analysis report

Static analysis result for SHA-256 328be7106a1b5b70…

MALICIOUS

PDF

87.1 KB Created: 2021-09-06 22:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2f05bee055c0ba163447b63dc0bccc84 SHA-1: 0ddf4ca4187e9933d954ece9dab2319a4359373f SHA-256: 328be7106a1b5b70c3d21893e7e0513c03bf2d0225977ccded159fe1bc023110
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely intended to lure users to phishing or malware distribution pages. No scripts were extracted from this sample, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/5e390954d4c1ebac255f3242b9bfd34d/62832916603.pdf In PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/26927c9c931ffe6cd04582239c07d0b8/44038616103.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/2591583203.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16071d9a130025---domopesimajuzekofatoz.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/14468080342.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/2de7654c201c8287a5d8d20c78448bf7/wipumafajarikawa.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/judibukuwutulivunawewedo.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/ea824adb4a3317e5e58bf209e3054cff/jidasizarumabok.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/jobenanemoronuganopo.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/13561118815.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/66966853108.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/8ab86483c48f46505da68857a5951e07/14323033957.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0840dcbdd---35133848299.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/98616551146.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/wizipugoxivupazaja.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/11505849690.pdfIn PDF document text
    • https://jin-ji.com/upload/files/futaparirisobozif.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/jumutudeke.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e023567ea---lobanuvaxus.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791aa157950---39621295571.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/gudalusobifufujelifuz.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/7ccdd2d9b92ca319e2a933c516ab89b0/33630326041.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/87744709716.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607076a0e6aed---14311507762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=tratado+de+derecho+civil+peruano+pdfPDF 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_off0000ea71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10288 10680 bytes
SHA-256: 62a6cdce5a5f12cf4a29f751b425b7e1e67faedd304ff61b206dc70723abc0e9
font_02_sfnt_off00011ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE5 19348 bytes
SHA-256: 46aa76ebf045a4a4c76314a31753cb91aec5fbffb888470e15f176080bd1c964

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