Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe9c9193d9a6373…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 08:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d1e633a6aa05f7a990627bc73053412 SHA-1: a33e241866f1ea2f166a6533cb16dea3d8e6c73a SHA-256: bfe9c9193d9a637324dfee5499d31beca8f67319eda6d1faab0c53c8cae22a18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links, many pointing to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://biogenetec.tw/image/files/20210923_052701.pdf In PDF document text
    • https://organicearthfiji.com/documents/file/49203706145.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614a140339259---febuzokojigulegubaxoxuxol.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/59515948479.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/39624333372.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/7361993227.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/44224526569.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/50688370926.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/12147808004.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/29034306871.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161304e93970a7---71970862768.pdfIn PDF document text
    • https://5udua.com/contents/files/86604720714.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/88214797982.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328f7017037---zutegurovewiromubebipod.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/wajoxunevexusoketat.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/43481304055.pdfIn PDF document text
    • http://expresskaliski.info/file/274204189.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/wugog.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/pagegeju.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-26/20210926001638475731.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/laxuwiwunirovifodelipu.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/46290762162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=chicago+pd+season+2+123moviesPDF 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_off0000b131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB131 11156 bytes
SHA-256: 255ab418b8c238bed13ad472f3bf018d6bac78b9dac995d20534184506317853
font_01_sfnt_off0000cb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 14768 bytes
SHA-256: 3e5f49ed87f2a7a7d3908a918eef4ed21ed878bd94bfe03dafa3362381fa3fab