Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d4ccd4ece0791f…

MALICIOUS

PDF

104.8 KB Created: 2021-09-03 11:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c87d4fa68bcdb6b785679dfe534e3630 SHA-1: 784f8d74766ee27f10c2cdec46854c740b6f038c SHA-256: e5d4ccd4ece0791f85db8b434177c217bfd625c0c779a4caad410b1fcfe93bef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of external links suggests the document's purpose is to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://chcial.ru/uplcv?utm_term=clustering+machine+learning+pdf PDF link annotation
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160857d5583378---xeduliwukukijevenowerum.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ncvg1mjuel0s5unhefj1bq2v95/60430770353.pdfIn PDF document text
    • https://produse-zilan.ro/files/mamupovulepu.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/85278073102.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/7adf8ed2e8cf6c0398f9688ae5bbfff6/zunokegofuzizul.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/58612369605.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/06/08/file/20210608_070705_169.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/wobulimotomurazobutozel.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/pebawoloterejotiret.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/cbd890b2f8821b3579cb61f4ebce2d9a/25402585493.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/49887866900.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/c93b0edfc2320b07bd9a68aefb87e138/sopunobax.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612140816ae38---19712322605.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/58956957630.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/kulojalapu.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/63853242543.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/madotigakuligasufabud.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/5a5424bd4192c385335af490c19f626a/sadovopa.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/desipuxodizedodetot.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b458942c2---72760949058.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/xovisomikutuk.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/zodagomusapap.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/lifubexurojosewelimiji.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/73452835179.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_off0001353a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D51 11076 bytes
SHA-256: a86d780bd9bc715e9688d3d67ad0ef93c90ab1dae789565340e1d4706ad4e554
font_02_sfnt_off000166ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166BA 18032 bytes
SHA-256: 25344c797a1f99b63c714e83523c3684ed3a484afb6595642e75b64e4cd4f466

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