Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2f86feed5f0d4d…

MALICIOUS

PDF

79.7 KB Created: 2021-09-03 09:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ebccbc758b298a76792a817e12daa4cd SHA-1: e3e76d73395b57aaca2c46332358ac4602ebf2ed SHA-256: 8a2f86feed5f0d4d5221e85e41224ebe4f9041433329847e0afd60658c19f8c9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress uploads and disposable domains, suggesting a phishing or malware distribution lure. The PDF structure and URL patterns are consistent with link farm techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://irlanc.ru/uplcv?utm_term=acidosis+tubular+renal+adultos+pdf PDF link annotation
    • https://contactfm.be/userfiles/files/panifa.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/oi26mo7gqakn7j8hva8fe5rk46/93558878250.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/60017876359.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/09ebba24b55553d66ebca952b2224c23/20010283613.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096aeb3ba821---firototamar.pdfIn PDF document text
    • https://alyansdugunsalonu.com/userfiles/files/parinotef.pdfIn PDF document text
    • http://5uempat.com/contents/files/xokolevenekogodewipofox.pdfIn PDF document text
    • https://digireg.org/upload/fetug.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/91895891341.pdfIn PDF document text
    • http://micruts.org/userfiles/file/97665837831.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/derafemalagena.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072c2186dd8f---mijunobaf.pdfIn PDF document text
    • http://teraval.cz/res/file/xetupikonojakofenajusude.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/vanorexiravesipopenulol.pdfIn PDF document text
    • https://tepihtrava.rs//files/14998210289.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/piduwanalisadomubak.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0f9be7ffcfe27492ec78bfa4a75038ce/92539060464.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/8e75197be19043eaf8c8e1cd9f74442d/modoferomodajazibi.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/molezodiv.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/61620901320.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945068a82c3---giwoderovovejumivu.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c835a3955a---fexuderugorejukofiwiwexa.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/6283bd228a8aa8b28d221040f4239d45/razidaxukikebezogewu.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_off0000d351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD351 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB63 17452 bytes
SHA-256: b74d2fdb2026ba224fa5246c412e86e35ef5342d531cdd3aa011a7ddc77ab295
font_02_sfnt_off00011898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11898 10836 bytes
SHA-256: f153f06a6ce0d386aa39ac66cc770b0cfdd3c1bc43055c358bada10c47d36e1f

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