Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd401601d8ddf5db…

MALICIOUS

PDF

82.6 KB Created: 2021-09-04 00:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7c8c631fe8f55a66b2545d3746993e21 SHA-1: 7a4d572c00b462364236978c141953b2799d0ba2 SHA-256: cd401601d8ddf5dbbe05bfa5d9fbf8074d8ea850c14fb49e07a3a002a104f999
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://sochi-vitrazhi.ru/ckfinder/userfiles/files/93554943019.pdf In PDF document text
    • http://shiny-baby.com/fileimage/file/84792993514.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/dinowovubuvizigijopow.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba5b22356---sodafitudejesevi.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/zuxotabenuwirotejuwof.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161290137e97ac---kedatekikasiwapikoginod.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/1121024202.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210531161415.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/lajokajoxerukekav.pdfIn PDF document text
    • https://memoservicesrl.it/file/14342618843.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22d04ba314---49221077101.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/bikavepukavoxalasoxomusa.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/89891582755.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e937cb41e53---57951608373.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612b5862bb470---10003472088.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/68110786603.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609970c319f47---nuvireza.pdfPDF link annotation
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/1bb3e74ae15cfaa38f896c28f1ac93b1/91000410372.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/timurazaguzepurapo.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/76526234499.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/83354579185.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/gapemibusobu.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807050c5ef1---tixisamusunaga.pdfIn PDF document text
    • http://keacg.com/upload/files/tadesejimus.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/cn3cvjq8q8nqcbp9v1tt2blmh3/51292774608.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/72f07e93e32c14c49749a386c8d89eca/nanibep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=treatment+of+liver+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_off0000de6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 17856 bytes
SHA-256: 7ba1f4c63ea2a8b576582a5c8237070df77f662b332f5a869a286fe6ce83f633
font_02_sfnt_off000124b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B3 10520 bytes
SHA-256: 3576493b65edb766086e1cafcc7b98d01b0d282cef0f48324c6631990d0cc419

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