Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b0ca0f04b456aa…

MALICIOUS

PDF

93.2 KB Created: 2021-06-30 06:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a890e4d50e07c0a28db3834906d2f643 SHA-1: 1af9315f7ef87c16387b5c1c0b10a549a4ea23f3 SHA-256: 39b0ca0f04b456aa3103c5fd837b139fd7f575502448a1cddbc8c844865514c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://abeess.com/userfiles/file/kadupobalokutu.pdf
    • http://broadgatecapital.com/userfiles/file/10206419433.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/jlni05gm8mkfqrh0625lb4vj52/linokevufudoxuwudovizuf.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c99dfd4353---lopidaxawepu.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099016a28741---62361365761.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b6b88b1c9---geboli.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ad8b64db9f5554324be6c3e79b2c92d1/2182004652.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797112163e1---6298651842.pdf
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/74170839060.pdf
    • http://mousike.it/img_ins/files/1992557755.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090796c1f544---87505325663.pdf
    • https://pottoka.info/files/galeria/files/99694580658.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/k2slf9eoqfd4ki4s0eu2v8t61b/72283121495.pdf
    • http://sake2metustin.com/uploads/files/jejufosolujugojikatud.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/it5d39ncmmnroglq0v0g0nrgtn/fakojiguwurirumojudesefo.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/6t49r2vbd9pvr0fjjb1scajaui/69453138831.pdf
    • https://euroroma-bg.org/files/file/3185650831.pdf
    • http://cuakeobinhduong.com/upload/files/luwunep.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083413a2913a---powixisepelugabufuvupuj.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090c04acc8b1---60066890273.pdf
    • http://gialtour.it/themes/userfiles//files/raxasotidixor.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160b6dac13c38a---31730445198.pdf
    • https://activepymes.com/pub/file/kukegixiwesuwavofot.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/8132270086.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=movies+quiz+answers
    • 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_off000107da.bin
50f92d15e12d8459299f6e32f5fd0ae402e5fa9d5175714250a30ae96e53690c
pdf-font-stream PDF embedded font (sfnt) at offset 0x107DA 10408 bytes
font_01_sfnt_off00011faa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAA 16792 bytes
font_02_sfnt_off000137bc.bin
ff8932c772d5e8f48a9c82cb06622b5c82572a69a29caf2f21ee45ae8aca1feb
pdf-font-stream PDF embedded font (sfnt) at offset 0x137BC 18824 bytes