Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a34f4e00e12d8c7…

MALICIOUS

PDF

95.1 KB Created: 2021-07-08 04:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cc2f0812f8980938c163434204d61989 SHA-1: 523721fad45892ae2aa6d8d82f057b1d15ff171f SHA-256: 6a34f4e00e12d8c70b27fc4966e05ef4b9fea676518432c71d290760f230e0e4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. ClamAV and ML classifiers indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a611567874---17989976559.pdf In PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/waxagerufobegut.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf0bc649f3---dawalagedaguzusinobidix.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/vtbrdobvfrp7tvco572kjsp082/64817018431.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/798a0c4u5us57d0mlui5g7lopo/84462214469.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/7d4635867b970cf837c8e55ea883fbcb/79099461346.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d67f33ae1---runagexofufapoza.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/e30e5kqji50j0nm9drh5car8h0/rovosuxamakijurad.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160927ffb6172c---xetaduzowakis.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/ddcaf28u0ekf56ha9slh0lb0i4/57518184641.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/15771068652.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/246qc3trqj7slfqv980jc8spv5/85712499944.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd155e4ae3---diretozoleru.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094cd4d383c4---xesun.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0c6df827a8b6e117970ef6df19e06adb/betabinofofetuwudivezif.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/wofonokekodusatolaz.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/69235313951.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/kurenulamo.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16098394d05a6c---masibaripedatini.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6de5c9bc2---pamaletotemisaje.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/sudipijoguvuxile.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/vqvstqi68hkaj2flojvb9jhdg5/83727475479.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/2735b8f797721bb07e5daf0c24a13aa8/65776245399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=livefit+trainer+phase+2PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF859 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_01_sfnt_off00010e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001267b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267B 10432 bytes
SHA-256: 1dfcd967378c79052e67e613a3cda74a24d766426fb953dfb1451e45f116dbb9
font_03_sfnt_off00013e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E22 18292 bytes
SHA-256: 5a6b2d360f3de0d50f9d6961ccdb506e3266da2a6715315e6c86c8caea871367

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