Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc934a94586a183…

MALICIOUS

PDF

79.3 KB Created: 2021-09-07 17:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ee57bb6c8914567e0002c843be1fd3db SHA-1: bd52c2e841894728fb30808901c1f19267517339 SHA-256: 6dc934a94586a1833c5dead613d014f8e49e07fc786e921a766dea7febe1939d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are likely used for SEO poisoning or to distribute malicious content. While no scripts were explicitly extracted, the nature of the URLs and the heuristics strongly suggest the PDF's purpose is to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cructi.ru/uplcv?utm_term=joyful+joyful+we+adore+thee+lead+sheet+pdf PDF link annotation
    • https://cissud.eu/uploads/ck_editor/files/tupukeduxororuz.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/nubodatiwevudexavesosodap.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5650f9d6b4---46302405119.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/latuwadinemorelusifi.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/xoxasarixavovoponerafodu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160be6cd6791f0---79185037885.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/69222394286.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/toponegizotiwuf.pdfIn PDF document text
    • https://airshow-bg.com/file/13442948221.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/lodeselimuwisubolebir.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///58689452078.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608afddf0a459---27538412825.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcad0559b4d---gulen.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/janoke.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/bovapexuzavume.pdfIn PDF document text
    • http://crabber81reunion.com/clients/b/b6/b60cf3d631ff247311937b5f15bedc89/File/duxopawutesotuxuwor.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bb0e6dd5a---68970295820.pdfIn PDF document text
    • http://progetec.org/userfiles/files/tojusuj.pdfIn PDF document text
    • http://poiskvod.ru/images/file/72084046556.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a28786a2cdd---suvakuvi.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/riluvifikufiko.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_off0000d03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03C 17536 bytes
SHA-256: 819160f76974ff36489e9536ca6c9f158ffc4a827f229d276233502d2bef8749
font_01_sfnt_off0000fe0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0A 10820 bytes
SHA-256: 2130c0b8831f2c0379ffc4a9dd4343010df178a6ab10b6e89a509ba5f7503848
font_02_sfnt_off00011752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11752 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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