Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4da63fc713ff363…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 04:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ccee25ff6e1b5d54d961474a31a0c76e SHA-1: c570ac98675e4952ffc3c0f595f4eb9b943ed427 SHA-256: b4da63fc713ff363b2cbede6ae24355cacbde8bf99ac6c48325cf575d9437fc3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farm heuristics points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pacie.vn/web/uploads/files/1490453128.pdf In PDF document text
    • http://staceyasp.com/UserFiles/file/sutenefitesalasa.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210914055403.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210914195600.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/tukalebonusoni.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/gutevojuji.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/95587308499.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/murupuvarekorope.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/momixofisuzujidifegam.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/43521231412.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/33345369231.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/10357890331.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5d6352294---bidafudapoxeti.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e0a2c8749---nagokol.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/mosoravumodopa.pdfIn PDF document text
    • https://cakkue.com/contents/files/81126930209.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/tafova.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/21233797631.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/reponaponewupowetobujori.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/tidazusofikosolizudu.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/71044106790.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9588d742b---zeroxasabilibumegovu.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/maxad.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/sts8chlc2gfahkm857vjtrihrv/17809640530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cheat+in+ml+free+diamondsPDF 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_off0000e1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AF 10652 bytes
SHA-256: 295f78574deaedd1a7e44f16923e160077ff2ed9020a1cd5eb783a0b02097d77
font_01_sfnt_off0000f9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DD 17000 bytes
SHA-256: 6cec0044f698ab3f05533236a41f88373c0c504d2aa10599d638b3dc71ba59ea
font_02_sfnt_off000125fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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