Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4b1924196a7df2…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 08:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3cf7784981a65274bdbeb37e493c6ee0 SHA-1: 4fda05f85f5b427bd0a936c4306f46dbea6d40b0 SHA-256: fa4b1924196a7df22f1c78bde688890f31ee66fb8a67a9a7fd2fd06f385e8171
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/bviei5m7bmqjkbslk6j9epalgf/lowogekugufasiluporat.pdf In PDF document text
    • http://lhjmfamily.com/clients/5/5d/5d8645f74963a96e1aea25f3b610eff6/File/68348091609.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/peteji.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f91217848a90535b8b48abe8c72deb28/fuxipodap.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/mavobovepiliwatuv.pdfIn PDF document text
    • http://ahchala.com/img/file/xeruw.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17842587161.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/vobapojifovotur.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/b76t0pns8cai7ma4qujqon0l15/sulubedudixobo.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/99383034725.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/xafurefijakuzuboniwimi.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/batagisabibujed.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/wanoxo.pdfIn PDF document text
    • http://szpk.hu/_user/file/3017066654.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/754ec040be57a063fa9749353797a413/41793426597.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/27825453239.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/65436348094.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/69814124061.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/gogeji.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c48f7c0863---movujufumedoxuxu.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160999c9c1ac3a---47075886294.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/67916960515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=transsexual+should+be+treated+as+real+womenPDF 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_off0000d479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 18032 bytes
SHA-256: 65ad26547c78cf89d933c074492218e2b834ec9c5c75bef68f0a6db62cafcd0c
font_02_sfnt_off00011b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5C 10812 bytes
SHA-256: ad6228d7ff4412c105a352010c9094a9e504068cfeb4df57040a208b919c4005

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