Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92b7cea70c4822b…

MALICIOUS

PDF

68.9 KB Created: 2021-09-03 15:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 54b1613eb8c5c403b88dfaf508bfa882 SHA-1: b12cc0a61c2143ede34fc0f1f6493deac1624926 SHA-256: f92b7cea70c4822ba1eda5e948490455acbf87688742e154956ab750fe48cdaa
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs a common phishing lure technique, presenting itself as an image to obscure clickable links. Numerous URLs extracted from the document point to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://sunnysolutions.it/uploads/assets/file/96581521187.pdf In PDF document text
    • http://nacyc.jp/Upload/file/94818030771.pdfIn PDF document text
    • http://rjt1.org/upload/files/jinudi.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/38162938959.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/1d6f1bm8e62n5lleoc6vrfn8sf/vevovememimoxefonut.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073c0afbcdc8---wujerif.pdfIn PDF document text
    • http://8njl.com/userfiles/files/divezamojumimoxabovu.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a367bf72a---75965373171.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/wopolixekukuduseruvujij.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/33eb9203c8d60d32e8dd546198708043/17430790316.pdfIn PDF document text
    • http://net-work.cz/data/file/57139680167.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/razevaw.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/39709110869.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/jobidesesasiwadig.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/nojiwun.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/56002697161.pdfIn PDF document text
    • https://lymfologi.se/anvandarbilder/221/files/945744669.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc1f2928fab---13390833529.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/88245059253.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/kunokamawobo.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/zilijolujazumewodevu.pdfIn PDF document text
    • http://rld-carbon.ru/file/57826132486.pdfIn PDF document text
    • https://wita.lt/images/files/6931272203.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/bimibodolejutuwo.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/sipafolovajijabunuto.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/puzefuda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=tri+tronics+classic+70+g3+manualPDF 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_off0000b226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB226 13916 bytes
SHA-256: cf7799775c6c45bb94f6f5fcfc7047fcf759dedb3e82a576304dfe4c54dcd65f
font_01_sfnt_off0000d494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD494 10848 bytes
SHA-256: c7cea7825e306195ce18701ee8398c8e3c3cd015bc359777549700ed4e5373ff
font_02_sfnt_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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