Malicious PDF — malware analysis report

Static analysis result for SHA-256 a785a1224a7c47ee…

MALICIOUS

PDF

67.3 KB Created: 2021-09-26 06:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5bb216cfad3cf5ffebb8a34481451840 SHA-1: 30292684b8856dde6864837780e4eb89e9c12391 SHA-256: a785a1224a7c47eefa4dedc09557fa3fa27daf333ae7d1b81a2bd96a821a768d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. Several heuristics indicate it points to compromised CMS uploads and disposable hosting, suggesting a tactic to host malicious content. While no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/9ad7d6990b0e7e85db6c6919cc63dee9/vokiwusal.pdf
    • http://gsmontaggi.it/userfiles/files/76555970279.pdf
    • http://blekinge.boj.se/uploads/userfiles/files/4220563274.pdf
    • http://www.radanhorse.com/resource/files/58938270138.pdf
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/20095051196.pdf
    • http://diplomat2014.ru/ckfinder/userfiles/files/tidefuga.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ev1fku1od36lrf1b0pmoqqfokc/binofimuwurititaran.pdf
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/bedamusokuwibizusu.pdf
    • http://ottomaniantextile.com/userfiles/file/lasogitizagolagebufiwigef.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/jir7rv3e5lbbemv8tmls20k9g5/26548549424.pdf
    • http://ccsl.asia/files/sawetederuzap.pdf
    • http://fijiembajak.com/uploads/ck_uploads/files/domowagomevejijetewej.pdf
    • http://biafrapol.pl/pliki/file/64456749283.pdf
    • http://csc-020.com/userfiles/file/20210915160752_a3kmae.pdf
    • http://seteo-dechets.com/images/file/23655169576.pdf
    • http://vietdubai.com/userfiles/file/1373549471.pdf
    • https://f27szerviz.hu/upload/files/7197718897.pdf
    • https://ijtm.in/userfiles/file/92415679473.pdf
    • https://detector-billetes.com/Imagenes/file/lazazasek.pdf
    • http://diennuocdanang.com/uploads/image/files/wemimidinudeb.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613de938aa9ae---48983730834.pdf
    • http://cbgnfinance.com/userfiles/file/74840218396.pdf
    • http://medicare-darmstadt.de/bilder/UserImages/file/tifujaletogajisekena.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=play+a+game+offline
    • 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_off0000ae07.bin
881a88a742c5f4c9c58647a01b4ef2d9c1624c78af2b355a0ad24a1d6654d3c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE07 10304 bytes
font_01_sfnt_off0000c538.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC538 16792 bytes
font_02_sfnt_off0000dd4a.bin
9b6e6d0c47d114263791eb03e674dcbe36036b6ccde3847b02419e7684b2cc7f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4A 13916 bytes