Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b8408db5c067d9…

MALICIOUS

PDF

86.1 KB Created: 2021-06-28 23:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2c5c8776d8123372fe8ee941d1966b3b SHA-1: aa55cd178cec2741a15d57109fe4123e0d369df9 SHA-256: d6b8408db5c067d95bcaf6ff469f75966df5618473812e14d2d13da866eb484f
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting it is part of a phishing or malware distribution campaign. The presence of a 'download button' lure and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further payloads. The ClamAV detection as 'Pdf.Phishing.Trojan' further solidifies this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098ba3fe2777---foxexumepasi.pdf In PDF document text
    • https://artbynela.com/uploads/file/roforosipepajimanub.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b62f8d18bd6---18908453480.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/3a2ca29935d98d5c7bddec7acdcbeba6/51576612901.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd1344920f---63536458211.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/86830a8e27878a52cc8a181d82197027/58689306864.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/gelesizipetarizo.pdfIn PDF document text
    • http://poiskvod.ru/images/file/nokumugagovivanadediguver.pdfIn PDF document text
    • http://bamila.vn/luutru/files/wigisowajejubuzonemixoj.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/wabelekaxuza.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/mojukalifoburosoko.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021061310472773499.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/h6jrrtreg9seq8h84cu64280os/2205332489.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/metawataluxomotevekotiwov.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/daxakifajijojef.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/3649c9dccbeae62319683667be6c9898/57630547028.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/k4ugh2o0bn1ldlbhr8ev03ptpr/93700222445.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/rexutepixisaxop.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ead68b0e46---wemigudosod.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///susosesofipuse.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606ffa8e31b9f---masurilol.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/fc58e0e7afe828b6d1d3ecef1a4ec461/69746642062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=during+reading+activities+pdfPDF 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_off0000ead4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD4 10796 bytes
SHA-256: fc813907abd9a4638d6a6f0fd3ac72c30295526dd81d9bfdd9138f93a69bf94b
font_01_sfnt_off000103ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AC 17576 bytes
SHA-256: dbc6b220e5b7961575167c6ba8b0f8482f9443149319981553e40cb6beca8b19
font_02_sfnt_off00013198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13198 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1