Malicious PDF — malware analysis report

Static analysis result for SHA-256 4517b825eaac7089…

MALICIOUS

PDF

88.4 KB Created: 2021-08-02 14:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 16e0642d91475e85a1a2374d928ed2c7 SHA-1: c32950c05bc85c2d5c3a876c14dc1479b2681b82 SHA-256: 4517b825eaac7089f82e6ae9e91dabb7723404967dadb2003511dc6a6c2ec267
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites. Heuristics indicate a link farm designed to distribute content from these compromised hosts. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088c8913a356---26768635238.pdf In PDF document text
    • http://biznesfishki.ru/files/userfiles/files/javotamiwugivepubobisumi.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/bulunal.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1rkir4b79qqcnhusmcujmi1bi/59735833314.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d4363237e34debb1ab7ad901b273beef/pidexumakokoxoxesenalunel.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/wakofufidudusedovupeve.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/kazezibaze.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec3675b4ed---52716246704.pdfIn PDF document text
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/fugobelowikav.pdfIn PDF document text
    • https://davnosti.ru/upload/493771364.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d418281c2---budosudefejezom.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/6d1c09f88d919a7fe6ddbd4385827d1f/86381163829.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/94affa779cf326f01f7c2d972c34d0cd/lelema.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607965160989d---difaxo.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f783b76d6---70481356487.pdfIn PDF document text
    • https://europartner2.pl/uploads/zanirutitoromo.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/tewipowozijajepowapiruriz.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8dc2e8a39eea5342f58e810fbc7d8af8/vexajube.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/37948958675.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202106200149252264.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/1636671414ef14b0b315167637690cc4/jinulotas.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/7d0eded61d462301c1574446764dbe55/sirafab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=battle+royale+games+unblocked+onlinePDF link annotation
    • 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_off0000f130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10942 17504 bytes
SHA-256: 64abb668573d2ef88c5b328e2d4301c49c1c5387156abae900e0248baf948c62
font_02_sfnt_off00013750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13750 11212 bytes
SHA-256: 965ac6362d002c89b0255449afcb1712638251b38697ba41efecf8c3388af836

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