Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf4dad660540a48…

MALICIOUS

PDF

80.9 KB Created: 2021-09-22 13:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0479b90de97a952c8549e834aedd24a2 SHA-1: d7a9a8a0e2b24c6cb5349493f70693f88154cc21 SHA-256: abf4dad660540a48fe39351b0909bb8d4cb2920c3497ec6d0fe4d65d6a8b8364
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF 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 or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crewmak.ru/uplcv?utm_term=best+free+mp3+download+site+for+android PDF link annotation
    • https://libertyrealestate.in/ckfinder/userfiles/files/27854615279.pdfIn PDF document text
    • https://forumsevens.com/images/file/43423895611.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/safofimoli.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/88765542682.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109022038425692.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/84793403980.pdfIn PDF document text
    • http://apple888.vn/luutru/files/xisatuve.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/5693591214.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/85252517531.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/41628750657.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/modebisuduxelaboti.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec276a43f7---65791374105.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135889e431be---52647950281.pdfIn PDF document text
    • http://rotang.net/userfiles/file/daraxexasetef.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/muxujabiwididonava.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb4fa460ba---66073516732.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/vokusosojogenixolo.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/49177912485.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/66172845205.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/64922753790.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/vekunutebuwiwuda.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_off0000d94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF166 10972 bytes
SHA-256: 84335723b9c330c86ff0e4f0016ddbb899464de34ed5351cbcdae155683bc5b0
font_02_sfnt_off00010ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE8 16808 bytes
SHA-256: 9fc63664d52425021d9990e6fc229671e3e249204ad8d610a880d851b66dd4b3