Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4b71cb3d3f87eb…

MALICIOUS

PDF

81.4 KB Created: 2021-08-15 14:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 6296b71d0fba71caff109fba486a428d SHA-1: cea2459ecba212a96fb3e3cd577a0f44cd7b56a4 SHA-256: fb4b71cb3d3f87eb58667b02616cd7f74007bec55f7175c6aecba50cf10cdb91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://good163.cn/Uploadfiles/files/masujesewejodilaxof.pdf In PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/80729c210d3bd95be7a112b630936ce5/73233270865.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/8464788182.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/86722871441.pdfIn PDF document text
    • http://giacongcomposite.com/upload/ck/files/wasemomazijaz.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8fd8605ef---jiralexanunim.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e1ce2a6717a---pigujerop.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/49466659521.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/55340934361.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/3g2ugfffanhdnoaq65j81km8f7/gijefazopusiri.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608743cf2aaa2---rotux.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/22219550958.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/2u6setntc7t0oadsnvrn4vkmgt/wiwukepitenewi.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/kajevubotosajoz.pdfIn PDF document text
    • https://wrd13.com/force/file/kazowalegokote.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/60359587474.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/25a0980290d17227a37be2044a0c15a2/33269149611.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5cbb58da0---niwebagosujeto.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/73010041981.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6d54b921d---13152463310.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/bdfe51e4e0fb566945cb069fbae1c8db/64987269752.pdfIn PDF document text
    • https://magerp.org/upload/files/86578815509.pdfIn PDF document text
    • http://dalaichau.com/files/wuzosujorixamufonuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+get+ordained+licensePDF 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_off0000db00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB00 10624 bytes
SHA-256: e6523e5646727ae0b558aad4a536d9d100f750d1cba423bd02e1af25afc29130
font_01_sfnt_off0000f337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B49 17100 bytes
SHA-256: c9e52fb950e6cd0215f88c89dd2ba741068cd4dbca0eea6b239621a433403a1e

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