Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4abf505c1bccd60…

MALICIOUS

PDF

159.9 KB Created: 2021-07-31 22:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a119f0e66bcaf2e1b69ee0b00945458e SHA-1: d6a571659cd662212027b23d2df0e9b1afacada7 SHA-256: f4abf505c1bccd60fc7c67b613947ea4932def558b903908444f533f3ed39aea
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed for SEO poisoning or phishing. The file's structure and URL patterns are consistent with malware distributing malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://pistant.ru/uplcv?utm_term=hindi+mkv+hd+movies PDF link annotation
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ucue28sg86ele1cp9faahg2qj3/5618333964.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/zejisatekigeborisobo.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/p6vtoa3s9jp2qahc1s67rnrsp2/96552910117.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/1a05c4cc54f513efc0a665db3f935c0d/97290034273.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/jijif.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/laxadunudojumememepukimiv.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f16aa6aded---70565270798.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/78532017225.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67bdd6fbf7---wesazugitaka.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaeb053c73e---jakunefibokufefomumenib.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/3c79e45ae516cf4d9624ec1b3adfaa27/giwidesekalo.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a893c04be02---juwegutazusevimi.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/83621792331.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/e14525bd9eb90bc8d860b505fe6859df/59896523677.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607633d12685d---nalefupiwefoliparopajigig.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/43337344562.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/giborakugumarowetixa.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/lirolevus.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/ronununud.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090be00d87f5---nituruselupeno.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bcf3d80dc---xegafujozudawepotedez.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/zonoj.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/rewodekikokul.pdfIn PDF document text
    • http://charivne.info/images/file/menakasa.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_off00020f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20F78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002278f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2278F 10256 bytes
SHA-256: d3b47ac054e080c1cd58bcd02453bdbc44dd3104edb64ad83ee2bc6401e0f494
font_02_sfnt_off00023e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23E50 19268 bytes
SHA-256: 8166184eaf3abd4df7b7880eaa04b643c3ce5011ec74cbd224bef99622d3ca11

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