Malicious PDF — malware analysis report

Static analysis result for SHA-256 a393f61a2859b5bc…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 17:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5e489896b9e2e02d33360fb177a1373e SHA-1: 9440e08515e061d70e4ec39de86a9e41cadccf80 SHA-256: a393f61a2859b5bc44ed3b481d02f2deed3bdd53b2398f625c66dea2913697d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external URIs and links pointing to compromised WordPress sites and disposable hosting domains. These links likely serve as a link farm to direct users to phishing pages or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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=pages+save+as+pdf PDF link annotation
    • http://aktifithalat.com/resimlerfiles/bowazogiwakanoneromafiwum.pdfIn PDF document text
    • https://tsolisp.com/files/file/rugofodivewozejuwex.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/b0300830b366c90ba2430536b3d3cf8a/gefipojeti.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d6eac389a---buzarap.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/9108731102.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/zavusiwivumusimovitabub.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/bac8635b78c0fea765befc1cf9e66c33/jodotajusurodakuna.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/46e93231da7733d19bf9144bdaf4f8cc/vesaguwojami.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/mevibosunepesinafosipom.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/27087616132.pdfIn PDF document text
    • http://darienhigh70.com/clients/878490/File/xamozivijuzenok.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fajekes.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/11112885101.pdfIn PDF document text
    • https://khanikango.in/file/vedibexexisopiwesijaz.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161262ed1cdaa4---tuvinomuvubulajaluz.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/e08t1gba3su4f6toa52ijp90uo/tifafezamakitaguwojo.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/1qvm5frcm29n7310cmib07mnl7/moladafekomavumedusinis.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/p9d38ri355jp274h3p467cp2j1/84158249642.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/mamug.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/xogubesofemij.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/nuvenadabogidokeriwan.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/46263430152.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/39012470506.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/1632468233.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef5213c687---56620413696.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/bedemef.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/82476282160.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_off0000e115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92C 10180 bytes
SHA-256: 1d6b32bf6f1575ac7b8b4b8f86a17783212c02f04950c6cd3e0e3233fc46ddcd
font_02_sfnt_off00010fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEA 17836 bytes
SHA-256: 97daf13119741ca1f3e7fda25c4586bfd3d553827fefd620a847a081e1295ddd

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