Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a03cde7ec1e50d…

MALICIOUS

PDF

79.9 KB Created: 2021-07-31 13:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b7a3de10940265bdbb48ef1c1a2aa88c SHA-1: e5adefc2132fde991591d094c6d96194b5891205 SHA-256: 37a03cde7ec1e50d2eee7affa18d22fcbb1e5de1c3637ee5d391fd4ad6526f0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to lead users to malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest an attempt to lure users into clicking malicious links, potentially as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ed530a28f---45326651499.pdf In PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/18lnm107396vf25dl9e40bo19s/siruvadut.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/f58283a71990d7c29bee470de2f60454/jejigajifasufagamige.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/p1bkmhdnltpdskc6rkuaposbv5/depuwigijug.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/69835142985.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/zonovezimolixebodu.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/d78100de94c90d53af3928f03995c4f6/tetagudozijenutedagunu.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/rinow.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/64680079065.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/68152626940.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/16298796122.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/89ce3789c89edcb6dd8c30b1b29a42cf/piwatuneb.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e6a1a4ae6e02d3c525db441340fa30a0/kefib.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/bvmqkkv43ef99gbim9ouabg0cl/paxalivu.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b85ef33acbf---siparunetu.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/iu0m7o07g33ludt57qrdnmvcs5/53363219792.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/428p4lrn3b1mputppgac10qras/29188359132.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202106181406092940.pdfIn PDF document text
    • https://tangente-mag.com/img/file/52861653409.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/fowafuxovutojatem.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/1e33c783f0fb5987f6095d723b94c3d7/lijizebazenog.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16077e3a39d2ea---zabojizam.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/82200331350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=limiting+reactant+problems+and+answers+gcsePDF 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_off0000d64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64F 16216 bytes
SHA-256: 055913a4d9c4b313dc2bdc4a2caefd84754a95f2329bffa648adba06268fa4af
font_01_sfnt_off00010028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001183f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183F 11040 bytes
SHA-256: 6ca6fd3f1f3f5846d3a42fd0cd3788e677d7169778ca931585aaccb53301fb93

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