Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49ad5ab0e5b41c1…

MALICIOUS

PDF

168.3 KB Created: 2021-05-07 06:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8bd6ce0698f3991759086a70e4d7c97a SHA-1: 0abf4ea30c4d3652bcf3f363c73af1a77d58fb11 SHA-256: a49ad5ab0e5b41c107cbefd015985a7631715da20e4a874ba5b6ba2bf34e6349
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a link farm pointing to multiple compromised websites, likely intended to host malicious content or phishing pages. ClamAV detected it as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of numerous links to potentially compromised CMS upload directories suggests an attempt to distribute further malicious documents or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8365

Heuristics 5

  • 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
  • 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.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7f9afd824197479e28c5a336665d787a/66175944743.pdf In PDF document text
    • http://alimentosldm.com/userfiles/file/rureweli.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/2m27vug52tb1iop4v1cmbbovl9/givutedosovupamunax.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0f960d981---fawapuvewokap.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8de0f2b7c---tejarabuxidasomuxasikad.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/aklfe9nqe458t0i9alvc92e90f/nitogosemika.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/gofopusemejesifefubi.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/f2k6dae01qitd4vh323stg5dmj/66552790870.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087fd517d2d9---11053474479.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/13df511e8d40e863f28469504cd03ed5/sukemozaxowe.pdfIn PDF document text
    • https://abeess.com/userfiles/file/30877385224.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/pck852cnejam9t8uhcpqkh10hm/69784097614.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/2t38o95jub5hohfb2aka834t26/lubamizinevusep.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/61dc3d0e1a04d45a9a4da7321b43c878/tigodedowebekepuvusosok.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/6go2gl29u6472l9pp6d6cdrlka/nipavonusiwov.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/u2c4s1i69iqoook54ua7qs3eh8/16693979818.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/73737751844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=angular+template+driven+forms+examplePDF link annotation

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00012dbd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12DBD 132432 bytes
SHA-256: 5d89f9f281890630187eb87726ee9c06aa82131b8aa6ab70cf1745eedd4bcbf3

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