Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7deecb377b59f4…

MALICIOUS

PDF

92.1 KB Created: 2021-09-19 02:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81d9e3626df8a9c7c50ebfb805283e2f SHA-1: f1cfdbc77cc6a23afdb7d4dae46586f330e6f085 SHA-256: 3b7deecb377b59f4ce695d9040d91dc89c4ff8533041a2234b07c89f5606d69c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://homelife-superstars.com/image/files/18764373755.pdf
    • http://www.kotolantopeni.cz/files/86501315223.pdf
    • http://shangyi-pump.com/uploads/file/151852202332.pdf
    • http://instit.ac/ckfinder/userfiles/files/buvobokulab.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614138181a6ba---butetoxiniruwutig.pdf
    • http://zgkimsteszew.pl/img/upload/files/walelukopotunu.pdf
    • https://pmcp-avac.com/files/upload-ckfinder/files/98850188940.pdf
    • http://misterholidaysanprisco.it/userfiles/files/rogegazumibiwagobetifiru.pdf
    • http://gr-chem.com/upload/files/92992538110.pdf
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/7165231390.pdf
    • https://aldaserwis.pl/ckfinder/userfiles/files/xetana.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef0fe1b447---gusakinevumivemedizamilu.pdf
    • https://panificioilcavaliere.it/userfiles/files/nozelusulaf.pdf
    • https://seger.cz/userfiles/file/22031984271.pdf
    • http://woykoff.hu/upload/file/kegigokugibukixub.pdf
    • http://usatovl.ru/upload/fckeditorfile/25227748532.pdf
    • http://www.sas.edu.mn/ckfinder/userfiles/files/lixadulidi.pdf
    • https://genegurumiraclehealer.com/userfiles/file/faxudirunozulutekagi.pdf
    • https://indiantalentjunction.com/milan/media/wijovixesofizaj.pdf
    • http://cn-polylysine.com/d/files/66796916780.pdf
    • https://tedesco.pl/userfiles/file/xarejoza.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301796b4ef4---83323941260.pdf
    • https://etest.vn/app/webroot/uploads/files/19798432553.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+print+screen+as+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105b6.bin
8e96f38c2ad905f55583d70e55a8b635440a66279e3ac41c68beddfc51c69e21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105B6 10644 bytes
font_01_sfnt_off00011e3d.bin
1c858681f07b81fd9d3b1404c582be97ea163164c3676417a7c610f73458b5da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3D 17228 bytes
font_02_sfnt_off00014ae3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE3 16792 bytes

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