Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cdb8cf30cd7a368…

MALICIOUS

PDF

84.4 KB Created: 2021-08-11 19:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e9a6fcc696d90a5e6e341afcdf4d34b SHA-1: bddd5c2d764b490c41058cb4c4ffa31b340dcdfd SHA-256: 0cdb8cf30cd7a3689c722f359a27c2e5e5c477024a975988d4a9a5cc45be87e4
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as lures for phishing or to distribute further malware, aligning with the 'Spearphishing Attachment' and 'Malicious Link' MITRE ATT&CK techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085134a0360e---tatutejusesenefuwakobufe.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d54ccc841c---52879155712.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803e706cbc4---xerudujegokufebulot.pdf
    • http://thetsaban3watnuea.com/UserFiles/file/4543845089.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ae5f19863b7e1d3fe52c320f9ecde3f1/98023410770.pdf
    • https://szud94.hu/img/sajatfile/files/dumamogiro.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160748bc69de8c---xufogimotowurexexazineji.pdf
    • https://hotelmitrutarija.com/uploaded/files/46493957411.pdf
    • http://lyonsmcafeereunion.com/clients/a/ab/ab8eb7fa8d7cf94b91f67e7e346c80ed/File/guvularateripururuwogoti.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075224c72b59---merafoxivase.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5bafa2f76---86546236608.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d83e346aefed29e165cbae5f8ad5f2b3/5942940320.pdf
    • http://harissarantis.com/userfiles/files/lobewepix.pdf
    • https://vayamcs.com/content_files/files/pivimafekofixobosubugigu.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/67949623465.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2940ee9702---lazepita.pdf
    • https://feng-shuiworld.com/userfiles/file/25476173106.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e1029eb2e---fajavolokofozepag.pdf
    • http://dtcguild.org/clients/80367/File/36354167551.pdf
    • https://rts-wm.com/ckfinder/userfiles/files/jesavadokilati.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8840d2a7a6---63708764589.pdf
    • http://carbonelite.ru/file/nevefazireloperafu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=perspectivas+en+nutrici%C3%B3n+wardlaw+8va+edici%C3%B3n+pdf+gratis
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c978.bin
934959ddc974f3ca7346649f7fbf79c4013cc9fba655d4707a69e71ee61c313e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC978 18420 bytes
font_01_sfnt_off0000f8b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B0 16792 bytes
font_02_sfnt_off000110c1.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
pdf-font-stream PDF embedded font (sfnt) at offset 0x110C1 16140 bytes
font_03_sfnt_off0001263e.bin
82f297f7ca711f7bebc8701060a2d62f34a5911badebff4cd7d82192ff7f80db
pdf-font-stream PDF embedded font (sfnt) at offset 0x1263E 11272 bytes