Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f6aa93368b578b…

MALICIOUS

PDF

81.2 KB Created: 2021-09-21 21:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 21e041a51292c2a3db6a98a7c8b546d3 SHA-1: ad09fff976edb495393c69635568a588f4a582cd SHA-256: c7f6aa93368b578b4c05bdd5c03d0e88de93775092d6ecf54fdc3ac88fe2d51e
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The heuristic PDF_RANDOM_URL_LINK specifically highlights a link to a PDF file on a suspicious domain, likely serving as a lure for phishing or malware. No scripts were extracted from this sample, but the extensive use of external links indicates a primary attack vector of directing users to malicious web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pixomot.ru/uplcv?utm_term=games+on+sale+android PDF link annotation
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/0fsuh37a12nncjvdcfd27bfer7/74630582167.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/30128694599.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/78843109739.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/61577120305.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/11260271731.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mazilumubigofufu.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/9221181086.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/789ffcf1a9c1667fe340e9e7d8dc0cb5/kelex.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/fusavixiweluzubomorube.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/90271627791.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/zapalasovesoxapibotizesun.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/19055001275.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/17148595332.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/bigubuzojilubedarar.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/95112858904.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/reguzejunugot.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/63429546312.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/27439566183.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/49082430074.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/82311844704.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/75823724461.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/movewinuleromedulekedarob.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfc47f2cc6---40973196453.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/95423318820.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/55204485856.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/tofeviriniwusipimukepok.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA42 17244 bytes
SHA-256: d999588ae56e6a2d00d9144854ddab1c2b025a568d51ba207577559e8f7ccd4b
font_01_sfnt_off00010758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6F 10348 bytes
SHA-256: 79330e41ca9054cd6a57cbade11dd9ba7397cda771655371b3a37fcb32361d22

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