Malicious PDF — malware analysis report

Static analysis result for SHA-256 76214a5d85a406d0…

MALICIOUS

PDF

82.8 KB Created: 2021-09-02 15:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7323905d8cc9d279a1dedbaa6947ed39 SHA-1: f922a5cc3d457d1d267063a192e31f8a75a6e016 SHA-256: 76214a5d85a406d02fa43964a4e5632a6a3890b68718f5ee2c48f4c1d11297f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to potentially compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for phishing or malware distribution, leveraging the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=manual+de+organizaci%C3%B3n+y+procedimientos+del+procet PDF link annotation
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/305a9e0dc5ae83545d3fbe9682173a4c/7311224378.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/37733b500f29851404eaf92447aabe82/80112060559.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/totusepowalurazupexo.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/lugal.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/54548663941.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/dakifomi.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/jidawekotavatavananiva.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607698dca18de---zozixaxiwuweniwifetuzutuv.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/tikekujisodaxakuvekovopek.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/bizosudadojigegumiduganud.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/givukewuke.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/wopobalep.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/jusarakalaxarajigareji.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bb50eedfe---89567660823.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812493b4e37---58920556047.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/2628791116.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/69290740407.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/xadaxiwarusiravib.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/temigimiviv.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/qhelehtmu5imne69oui2cu31t3/29523839954.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/82455065038.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_off0000d8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A4 19120 bytes
SHA-256: fa77860ac468e8400bcca85a8c20bdce16118004937f7db639a564a3573eff9c
font_01_sfnt_off00010951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10951 11260 bytes
SHA-256: 35c80f9121ca7ef58d9961d3b1d473e3b002678b10f0fb1dc1314add31098887
font_02_sfnt_off0001234a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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