Malicious PDF — malware analysis report

Static analysis result for SHA-256 6761c7faa66493b8…

MALICIOUS

PDF

86.7 KB Created: 2021-08-20 19:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5b2f29361125ba7820a1dd61cc0d5b9a SHA-1: 81c44b70c5d698bd36135cef18c3c7f229222846 SHA-256: 6761c7faa66493b8138fd516e62643c689ad4dcd49c0ecbd37db881126946d9a
156 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 high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on potentially compromised or disposable domains. The presence of 'utm_term' parameters suggests an attempt to track user engagement, common in phishing or scam campaigns. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://pixomot.ru/uplcv?utm_term=como+limpiar+manchas+de+tinta+en+tela PDF link annotation
    • http://sarlampa.ru/upload_picture/jepakozetepupit.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/jixixujig.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/67525161852.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/67882801757.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f11292f30---84129413761.pdfIn PDF document text
    • https://neplatnasmlouva.cz/soubory/dagupazelokimilu.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5a32372b4---sanajuni.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bc39966c9---96055584639.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee41b1079---1725536583.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/selekawup.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dbe08be34---nozitofalawolemexuwonux.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/01vjrn2e9a0c4hjmfomqj5e89a/samijikufabexobadajeri.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e952216465f---17183648423.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/titowu.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c573aa544c---titobaromipuralapej.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/b6a70a2a9b5f55e2bbaeda1c1c4fa0b3/gosawe.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/gazosumivabagutojuzu.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf5180edf0---tolipunezobub.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/bawotabevuvibo.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/bb674033b92a70bb1cfc0fcfdd2bafcf/daxefamederixex.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/re11ueuibtudvn87nj1cfecnoq/tinajurukug.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ffda814407b---50489352158.pdfIn PDF document text
    • http://www.puhito.hu/uploads/ramalemumimevusawoz.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/jevureri.pdfIn PDF document text
    • 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_off0000ee2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001063c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063C 17024 bytes
SHA-256: f9f21a04e8d9bec8bdefea5b7da1b9c6146a7fd08c3623864fa385028f4306ae
font_02_sfnt_off00013116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13116 10808 bytes
SHA-256: bc80953a78318bfd53fd995e7ba7c7a993d927d0833d6d5c680e82777b956967

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