Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77651372356db45…

MALICIOUS

PDF

80.3 KB Created: 2021-09-21 05:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b7a42a2b87c481df3d46008e66807257 SHA-1: a586b48f4198e6bea35470854eeeddbce6c5b1d3 SHA-256: b77651372356db452df4d7aff3a93bcf853b83e08ddfe5558d4e7ced68c16af8
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 upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.herbertvanderbrugghen.nl/draft/gatefasurimet.pdf In PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/lefelodililatatarol.pdfIn PDF document text
    • http://wami.cc/data/files/85040671646.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/d003faf2c6f90dd45990cdac3bf6d745/zabapagu.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/jumasesamuwuzoru.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/tibelegejepenili.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613be120c8f35---wolije.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/161427f12a84d0---92297227332.pdfIn PDF document text
    • http://melvin.cz/data/91416455850.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/milubipudus.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/80932974797.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/gujametufasiwuziruw.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210909012335.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/59808450724.pdfIn PDF document text
    • http://modern-pro.ru/files/file/zijarokodawonomi.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/93552204114.pdfIn PDF document text
    • http://centronegozi.com/public/tomolesikipivun.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/79362239868.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/79619854156.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/topumevevagemixerizabafa.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/e68l9bbfh0o2075c35402i8sf7/7160747484.pdfIn PDF document text
    • http://vanhacollection.com/images/files/11324238155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=sadhi+maa+jarur+aana+full+movie+download+filmywapPDF 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_off0000d207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD207 11068 bytes
SHA-256: ad62d5c9bb8bafb02068d4ebf9e0b6f05c60ae18b585bac558f0225a1eb180b2
font_01_sfnt_off0000eb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 18404 bytes
SHA-256: 7e02f8292072a2250fe533fd49a7dd328590397c93ae28ed981c527b26210d1a
font_02_sfnt_off00011bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1