Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbfd3aaca0c478cf…

MALICIOUS

PDF

85.6 KB Created: 2021-09-16 18:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 86ea9def37382b171be69cd0191e15d0 SHA-1: d1fe7b37a3e8fc918da9093e06c3caa2ac5ff98a SHA-256: fbfd3aaca0c478cf929de431158b243ce32c143b013d5237f920e624135daaba
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 CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.mds-horizons.com/upload/files/pamaziraxewig.pdf In PDF document text
    • http://gps-tw.com/CKEdit/upload/files/22301254010.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2610cc056---59904432344.pdfIn PDF document text
    • https://ysh.my/userfiles/file/kifisuneni.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21582213867.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/47423568273.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/97808833747.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/jemokabegavonivumabom.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614161c3d8d80---nepivenaririkutizilidir.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/61952796767.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e955a6209---83663479057.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/wupopomolirizuwenalerawit.pdfIn PDF document text
    • https://bnovum.hu/downloads/21557111603.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/jebesubofufeb.pdfIn PDF document text
    • http://sunrise-photon.com/upfiles/editor/files/wivolozezegogusad.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/zaxitupixedep.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/44226851326.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/40719194605.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/xaforobuvabamo.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/0bc80c10d2f5faf506861758fa241d6c/91406006589.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/93460854849.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210901_161559.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/numapexevibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=activity+tracker+app+androidPDF 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_off0000ebff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFF 10548 bytes
SHA-256: 27a06f8217981b7c4f31d145b2951e275e2635f6d02ca726914de5593df27db0
font_01_sfnt_off00010433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 17168 bytes
SHA-256: 4d80ba0100fca6ac5fa696c6e2281ffd22c94fe96eafbe1daabcb5e5d7a6dbd7
font_02_sfnt_off000130a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1