Malicious PDF — malware analysis report

Static analysis result for SHA-256 551fd84ace237e31…

MALICIOUS

PDF

86.8 KB Created: 2021-06-25 21:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04141baa46d57e131a5a52870bd253fb SHA-1: 4d8525fb7e5b98d41828906397343d44184567c4 SHA-256: 551fd84ace237e31e033906b92a4b477c8a506d2fa22333215b19a0fc1288807
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm or phishing lure. The primary attack pattern involves directing users to external, potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160720c1f79da3---16488342222.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/034b9a3b29412c5fababa6ab75dd833f/lujexotatogok.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085a18e39263---52801381647.pdf
    • http://daiichibus.vn/uploads/news_file/giral.pdf
    • http://agendatourvietnam.com/hinhanh/file/lenopaximurorifevi.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d54f5cb39a---34152999156.pdf
    • https://soudurelauziere.com/upload/editor/file/73126053457.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/a057b0ed9c5f3d6321db52416e634e57/wibagogodogojizu.pdf
    • http://maxtarget.by/ckfinder/userfiles/files/lugezajagixudejo.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1a2636d35---nugumawemewibeneto.pdf
    • http://dalaichau.com/files/razorimuvenotivefanam.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb51f7ad5d9---vilasoworamo.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/r3tbrji4q6vrfog51l15cqn422/butiwatamapalij.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/4q4kdvglis2ktoas7mn6vj2akp/8186756239.pdf
    • http://usarsenal.it/userfiles/files/dodufezebanigow.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16080e91269a3a---62735647905.pdf
    • https://etimes.mn/uploads/files/jigiku.pdf
    • https://andrejc.si/files/file/71731463541.pdf
    • http://homeopathyhongkong.cn/files/donavijuluvotomewufus.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a265367e6---76849953044.pdf
    • http://remont-etalon.ru/upload/files/78634418081.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/5f42263fe8830fcbc1b73ee93ae8fe7c/92156127219.pdf
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/95790942926.pdf
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/44839043888.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe33a178f---baketoz.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/9583a994f582280c77ac2afe6da1ff2e/19252728059.pdf
    • http://bomtvplus.com/data/board/file/20210525210826.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=gmat+ds+answer+choices
    • 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_off0000edfc.bin
0659111715f7342e09e6763ed0dc2e7aeafe262c2ad8c5cec806a301b14a8f9b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFC 17540 bytes
font_01_sfnt_off00011bf3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF3 16792 bytes
font_02_sfnt_off0001340a.bin
d0259a3b5e5c8a9789b280e772d803cc8ac15bba61151c92f2b3b7041494d43e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1340A 10716 bytes