Malicious PDF — malware analysis report

Static analysis result for SHA-256 75573a05fea6b38e…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 21:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f0b0719157c7bf121a817f9dfaa7110a SHA-1: d31fb36444cf9b0d3e0286d5eee740a9454f1425 SHA-256: 75573a05fea6b38e2578b9b94719b0071d3e2ce71319f72e5fdbcf614f908214
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is likely intended to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=mentors+book+pdf PDF link annotation
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/fpkda11u0oe8n5inf694qqdsn3/48842823185.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/nukufuxatigow.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3242a32f3---88797483171.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16129dccda8695---xajajerewaverasewafuma.pdfIn PDF document text
    • http://gphs100.com/clients/e/e3/e3ed30f4e85b1ff1e74f61348c82e8eb/File/vasuxixozikutelumum.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/rn8gudbno1k6804bj7iktpunds/10071468142.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/c07aca76a1921574efdf60a8b16a2293/70736752169.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b81558bee6---1159930151.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/7sqmj5if7ajsembo67sujgtn06/98168812504.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/rdgossvucp31025vs6u58r4re3/nuzewekonawewowokad.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/11605f2e358c6d806deac53daac4825f/69951183221.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/wiriwunopezu.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610afe56292b7---7382126156.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/tetejorejefataluleg.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a307bea2e6---73362297125.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/sedetodegusunedomudugopa.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/792f4970cc901a478d9a3493d1950f05/53844630992.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/53295241529.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/34748718989.pdfIn PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/bemewidifovekixiditodos.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/62314815885.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210619175759.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/7457457157.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_off0000e2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D9 10416 bytes
SHA-256: 155ac1d715b8550b1ea0c2582e9a2152ce23447223339bd59c4f28bdcee7690b
font_01_sfnt_off0000fa5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5D 18404 bytes
SHA-256: 2879f469a6d0fc87f5e470aa8a600d1baa099e8d9c943b1d1028031b9eec2cc0
font_02_sfnt_off00012a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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