Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e53be9af130636d…

MALICIOUS

PDF

92.6 KB Created: 2021-05-07 01:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6118f369fb9df158beb4328279e2d09c SHA-1: 69fc37ea3a1142c47e3051e6a6da4c4b1dda128f SHA-256: 5e53be9af130636d415f7dc36c904a116e8160a0d40db9d2a1c995064f4b3eaf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the structure and heuristics suggest the PDF is intended to facilitate phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6907

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 https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fb20a1dae---41008158278.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902edbc3257---jagetiluzavibip.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/df041ddfdb239c1bcb549b93791411be/19108158587.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ijrucllmoegk4iams8t93nakc4/91734084596.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba85bbd368---83144749462.pdf
    • https://unosms.us/userfiles/file/kigibofoguzo.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075ba3308e3c---66826273097.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/vhimv1vfe3pqcvf23asbgaclj2/merikiperupad.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/f49119f04c252a2a92cb164675b68f92/viradanagajelulojeli.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/4a0804ee34a64aea68628f263f72ec1d/baxogovijutanokikonis.pdf
    • http://aimic.com/userfiles/file/41139473903.pdf
    • https://zlatartopalovic.rs//files/xunod.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/ua47lmq0lmhalqt2idmqmrvlv363e6ph/gupif.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091394a9f85a---kabojularurote.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ede9856e5---79506002388.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093f55798617---68637215224.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=klasifikasi+fasciola+hepatica+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012fd4.bin
a35925810bbc7ad27f03e4edd3a4439f34d04171d51ae98bfa767d70b7b1deda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD4 5180 bytes
font_01_sfnt_off00014175.bin
443faf77f6ed29fdc064fbb1b4453cb42f33fc26fa21e46408ae5f37bc67dec6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14175 11960 bytes

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