Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8abd19342dd40e…

MALICIOUS

PDF

74.9 KB Created: 2021-10-05 00:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 252dd6c20092302696cde1b767b14b3d SHA-1: ecc3f3b86a64b9fc17e445bfdf9cc91ec44ce1cc SHA-256: ce8abd19342dd40e2c842df7282fa740df66156a693de0188705624da2629157
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting. These URLs are likely used to host further malicious content or redirect users to phishing pages. The presence of a 'link farm' heuristic further supports the attack pattern of luring users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laborke.ru/uplcv?utm_term=how+to+lose+weight+on+hips+and+tummy PDF link annotation
    • http://alpanelektrik.com/depo/sayfaresim/file/62218973598.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/wufebupepomoga.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/gikuj.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/75038686481.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/mikuvogexupemujawi.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1615b6f6129e30---3667838674.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/10171407868.pdfIn PDF document text
    • http://apex-architect.ru/images/file/dofav.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16130ad3cda6a2---wisifadet.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/5938710747.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/60707661219.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457adde3a1c---suxuvokemofixe.pdfIn PDF document text
    • https://fishuntpesca.it/file/seloruwaga.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/dosif.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/49082430074.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613797f85d89c---55742985762.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/lazepadozudagaxosef.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/putekufoxibilutawulu.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/29868525880.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/4045bc462a10c2bf7881f295e5044322/99137816726.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/nafupu.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/bodomirakubu.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/20270496359.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_off0000be7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD695 11028 bytes
SHA-256: deb2d94b627431175870e61ec619cf810277ca267b1b116bfe894cbb7fb61f52
font_02_sfnt_off0000efde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDE 17756 bytes
SHA-256: 2f7aa05f16fe152f53d68981de441476cc07e7b5c4fc27a65208b2d4b5aabdf3