Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e1bf80b77f5e17…

MALICIOUS

PDF

68.9 KB Created: 2021-09-24 17:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c7cc34286f56444451293793e11ac70 SHA-1: 790356f5c684cb0dc828abe1934325e880e127f9 SHA-256: 43e1bf80b77f5e17e7a1ddebb1b792e58190893429fe334abf2c34a37d4e5460
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous external PDF files hosted on various domains, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple PDF link farm heuristics indicates a deliberate effort to obscure the final destination or distribute payloads through a chain of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://praconsulgroup.ru/pict/file/21359695046.pdf
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/jaxani.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf9d13b8c---xalumed.pdf
    • http://www.jasfec.com/imgs/uploads/36904326325.pdf
    • http://gainliving.com/upload/editor/file/baliwosakuvizufofitipupif.pdf
    • https://dpengineers.info/admin/userfiles/file/zagivalom.pdf
    • http://luxmeterthai.com/ckfinder/userfiles/files/kifodazixijizidev.pdf
    • http://netwindowvn.com/uploads/userfiles/file/58042902540.pdf
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/1764522486.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4d7e12af6fa825b9c29302e51299ff47/87463216769.pdf
    • http://abwrva.com/uploads/files/gavivonivadukubuguzorug.pdf
    • http://gesht.ru/admin/ckfinder/userfiles/files/bowilubotolomokawoxu.pdf
    • http://belniig.by/public/file/26377405377.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/fa2cb0be2027f1bad722620da8015532/24665710778.pdf
    • http://kirsanov-maslo.ru/uploads/93620972256.pdf
    • https://badanie-wody.pl/galeria/file/1800762515.pdf
    • http://guowangcable.com/d/files/39790805210.pdf
    • https://lux-ride.com/home/u4-6pzgszajsb5u/www/lux-ride.com/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/65102272212.pdf
    • https://apartmani-mestrovic-krk.hr/files/52818033319.pdf
    • http://studiogaleazzo.eu/userfiles/files/90750037045.pdf
    • http://schturman.ru/files/files/36142280552.pdf
    • https://rajaketiga.com/contents/files/fixanunobimixumotoganuba.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=adw+launcher+premium
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF17 16792 bytes
font_01_sfnt_off0000c729.bin
bb87157bf2009be1d08870fbf1bd34eef158381dc3c69c1be7c3db985e636b0d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC729 15632 bytes
font_02_sfnt_off0000ee8c.bin
da55a5a7f3901c3595fa75333edea2b93fe08768eeb2e066364de51799e35c1b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8C 10560 bytes