Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6639c38807862d2…

MALICIOUS

PDF

62.3 KB Created: 2021-09-01 10:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a6d5ee1cc8c0c39309802fc1872d28f SHA-1: d71a79eafbda8f39f97d0300231f6882d14986f6 SHA-256: a6639c38807862d27d3c76f9b7fe08593c268fc059e4467de37dea34fe06ad4f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting, likely to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6065

Heuristics 5

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=visual+studio+interview+questions+and+answers PDF link annotation
    • http://lesmashclub.com/imgUpload/files/bimisenivewegire.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/a9bea0ce253fa5d4c778b9269594cc10/34679224802.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e01ee527f0---xotemos.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bd39abb3686---vejododejuwubafopozis.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/tbau016to8megg2a69jud3mbco/kenifa.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/sozugujofowepakubejorulex.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/vaxadomefarimovixawofazaf.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/9bbc83cbe68b9b083538838fdea3d226/ziditunagiraroluj.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f04d48607d8---91351312868.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/zuxozasobulesaxomaxe.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ije75h59h9ph3jdcg2pu1gi6bl/kawezepojosenanisudurex.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a14c00fac4d525aa066c61f7f9ac7fc8/41320247947.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/eeb7246e109cbc37de5982d982cf682b/koxirigigew.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/loliwuxokujozovozoz.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/27538781479.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098352a82d64---93225334574.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/50815942783.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/37821458c9d0152b515fe1f6b51e8957/rogolagasaruzatu.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/b1c33fad3a36e200882b3a707c906cdb/95325822361.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8cd4d37b---51453228610.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b306605780d.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/lapuw.pdfIn PDF document text

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