Malicious PDF — malware analysis report

Static analysis result for SHA-256 658c5d4796b340f4…

MALICIOUS

PDF

74.5 KB Created: 2021-09-07 16:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b93e4c2483009627da2165a66def406b SHA-1: a90b75b9b92310d45ff268c73bb31c76324c0504 SHA-256: 658c5d4796b340f448111d04ddf07fcbe14c24227962c3900c67f839baccd2a3
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains, suggesting an attempt to lure users to malicious content. The presence of multiple PDF-specific heuristics related to URI and link farms further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=indicadores+de+gestion+pdf+libro PDF link annotation
    • https://panama4d.com/contents//files/23121510737.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609252644dee4---59187221003.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/xuxej.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/67334031444.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075b94c13743---pexaguvelivowoko.pdfIn PDF document text
    • https://bio86.net/fichiers/9584745389.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/64345818991.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075f61200a70---suvajejiferuzaf.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/pivololibife.pdfIn PDF document text
    • http://cichanski.com/Upload/file/mizegalori.pdfIn PDF document text
    • http://sivam.pl/files/file/56627891353.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/94067309221.pdfIn PDF document text
    • https://campermagazine.tv/public/file/xewakiba.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/4b8e16593544f7a2567f4d3e3a84da0f/74800899586.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/zotimonikazikufejiwupe.pdfIn PDF document text
    • http://innotack.com/userfiles/files/12033908521.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609df1925fe53---noxofizebewofukolaro.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210502022640192.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a189685873---88734868005.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/5qlln6grvn6vgipmb48jud3a4u/vumufikezijudoxexupid.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160cad919d8c49---vugasowirugowibotevemu.pdfIn PDF document text
    • http://jarosi.hu/files/file/niwujedudojutetetebi.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/fedobekukiposobabigatuve.pdfIn PDF document text
    • http://one9five.com/userfiles/files/24746991544.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/097a800be47869ed1db441997dd4a7c9/zolarakidikaditotediruxe.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_off0000bff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF5 10888 bytes
SHA-256: f7eb1a6394a2875056a00065ff4868f35e4a8d023156fa3627d2f15e850fa812
font_01_sfnt_off0000d8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 17532 bytes
SHA-256: 93f64a9b0edf68931b2d78fe9f005d27ce8dedeea06a08eb40110c6074b07180