Malicious PDF — malware analysis report

Static analysis result for SHA-256 de487ebbf6f3d555…

MALICIOUS

PDF

110.9 KB Created: 2021-07-06 16:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 709e0ac457a174ca7f895f07a97ac2f9 SHA-1: a3e317d33d5e4c4799813d89ddbc9bde63625456 SHA-256: de487ebbf6f3d5554d95ebf0283955289a1f8b316d597dd4af29d08c273feb7d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and other potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 6

  • 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
  • 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://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/28362878726.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866459526a6---71653234319.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/8l2plhorsbge9n8k7vvfq0tqir/wukigodetove.pdf
    • https://ilmercatinosottocasa.com/file/63669669501.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/9506d0ca3faea41b5c91c274b6e0c1c0/resagezoxujurowuvuxa.pdf
    • http://slanfusa.org/clients/47225/File/50743303965.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2a4dedc2aec601ee7d3682606069ace1/wisofixoru.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/loubn68h4t2tmeu0ap97dfoj66/sibimif.pdf
    • http://savvyais.com/userfiles/file/lafamaxuvomerine.pdf
    • http://wojno-stal.pl/pliki/file/78052997061.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/b5cb0b644df251c6ffd3470b5933335f/51363560467.pdf
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vasakis.pdf
    • https://lawina-radom.pl/files/file/38792897580.pdf
    • http://nakatka.com/files/file/5465042058.pdf
    • https://paperland.bg/uploads/file/84820325599.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/92bcb59c5b2ea5ff49740707a967e6a4/29048254078.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099900b06eed---24384954908.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4afb9c34df---91424929239.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/f1a88dd77b9c23afa7351346e99a283b/bolelemupadopefawubowogi.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/m19n3ihbg6ogdk5ke02atkn7q4/1132308186.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/94c831621fb0057a25a363841ca30da9/zonemebexu.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/943089d1a583d8d48d002861fe21f3df/renojudobiva.pdf
    • https://cowichanmusicfestival.com/userfiles/file/49823751733.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/ub9779tnd88r985an95tamqobf/xelanofifem.pdf
    • http://fecoil.com/userfiles/file/vutupaledimirilozanonex.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=dbms+question+paper+for+bca+pdf
    • 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_off00014c76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C76 16792 bytes
font_01_sfnt_off00016488.bin
f038ea03f9b51b073471e3df2ac9400602f5debc1d050ea87090a83c5b0ee2b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x16488 17448 bytes
font_02_sfnt_off00019264.bin
7a9fa4dcc669bc7d05342c039e456b0dfbbf1f933e90f07265479d8b1e3e91e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x19264 11120 bytes