Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c47f78300d05cb…

MALICIOUS

PDF

94.8 KB Created: 2021-07-29 22:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: eff3b4a89d6d5b63fee691bfa445b451 SHA-1: f6f6497d14929bee7cdcd5af9c9a4d39dd04812f SHA-256: 44c47f78300d05cbceecdc7ec8e1fde7c5a44f6bb27b2b861b591ae3f22ab251
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.papelerialapiceros.es/ckfinder/userfiles/files/54588621669.pdf In PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd575cadf5c---97822684133.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/xurenidakatifazatuzowidig.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/d320c593641a0ed7aef1897b94fc49b9/dozevol.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/vt6ta84mit2t6a8v57r0vqk204/nuzogakijaketara.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/86116165217.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/22704799703.pdfIn PDF document text
    • http://trekkingsapatours.com/upload/files/58797540595.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160915988d32fb---toxigivaritofugizajewuped.pdfPDF link annotation
    • https://nutstudio.it/userfiles/file/zogekabakiti.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/15201786898.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb81096f958---51056235970.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095db78f356e---xutage.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/65783372185.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/jiduretutunevasosi.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/girunopodufiwonofebugaxob.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d45fa9843---71203593310.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/selewiluv.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a770d849cb0---zenimaku.pdfIn PDF document text
    • http://e-hematologica.com/users//file/ripasijovi.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/vuruwabarubazofodoj.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/34611628997.pdfIn PDF document text
    • https://nistd.in/userfiles/file/tomefumuxupigomu.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/da36b03f6a966fa31fdc61dce76eee9e/81281794177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=mini+dachshund+puppies+savannah+gaPDF 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_off00010e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E55 17880 bytes
SHA-256: 1aa28b4be8969966dfbda4a8cf3ab19246b966d13f62e911e4611ef2d546eded
font_01_sfnt_off00013d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D91 10588 bytes
SHA-256: 9ab8d34a2d2dd93efb135e5ffe80be2956bd4303fb0391f41fd4b8f0f342b264
font_02_sfnt_off00015576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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