Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb45dfa4896df92c…

MALICIOUS

PDF

93.3 KB Created: 2021-09-06 04:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: de8459fad57b8aac9e915cf435d9590d SHA-1: 67555c994f5e21dff940d3363b29973c92a1c67c SHA-256: bb45dfa4896df92c89fb9f57b23d40575fd361646ce88abd1f70f8bf5351b405
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to numerous compromised websites and potentially malicious files, as indicated by multiple heuristics including PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://pistant.ru/uplcv?utm_term=convert+to+pdf+imagemagick PDF link annotation
    • https://phukienbep.net/media/files/84503969134.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/4508389680.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/60a5394d91ed2c68c8c2b0bb8324f26d/10606520414.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f80bd81c2f02af47c022034b7a4c9a19/10175640371.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/nurowujatonenikipusuzak.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/7s1759q4slsl8tm940jm6j0n94/64487480689.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/6datl70npp4n01s69csoqrut9g/padakuromorimew.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/rqtieie7mq9s14mqtega7pkpup/80531560077.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/s9ui4gg47af915clegfmfvra5r/jawiwezozanamo.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/tuvomoradizojibabogotazu.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/137d1ef5c2612332a19d22607ba2fdc9/jopulejit.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/kunitatalepeje.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/mebeduxunisi.pdfIn PDF document text
    • https://makanbanyak.net/contents//files/golusegafivinixe.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/99127534503.pdfIn PDF document text
    • http://seja.lv/assets/ckfinder/core/connector/php/uploads/files/41369755862.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a25fff572e4---sivisodefi.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/426d0c3ed498839c33212ff4c221ee8a/gaton.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/diniwil.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/ac54d880aea301ff4c23e487f52e5ac5/xasatejobeja.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/51821344080.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/nojokasoravibasiwewafupu.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-06-17/images/files/24586698080.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/nukasuverokaduronenane.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/sfg7p36cflobd6erbrkm7un2fc/59241128420.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608114e5290ca---wiposagepuzix.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_off000100de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 10940 bytes
SHA-256: 039d1066f8a36102fe5681c049ff200ee9c095bbcb7116c24fda3ac591d4b776
font_01_sfnt_off00011a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13226 20808 bytes
SHA-256: a6936c508187cf7b5f38b2322d9116043d8f9771bd7ce8f8e59459e8d7474e06

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