Malicious PDF — malware analysis report

Static analysis result for SHA-256 33aa6e6ea7ed8595…

MALICIOUS

PDF

73.6 KB Created: 2021-07-04 03:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3fd48b3f5e9f60db1900e6a3ee455ba4 SHA-1: 2f6f7e54d7fc441ee1f4fae3c9a04606d79f6cb3 SHA-256: 33aa6e6ea7ed859524e99ff9c2e10d5306bdc92055de5adeb4a286bc4a1e9244
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drafthe.ru/uplcv?utm_term=bedford+church+of+the+nazarene
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/6ouj1sm45r03unn6i3n5idkn6o/watesitome.pdf
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/70917636057.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c324422e3d6---18669129128.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3acf0fb53---silejovivagu.pdf
    • http://xaydungphongphu.com/uploads/files/depexawukevizi.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/38fbc39a7e56424fa349ecfa8d194bc8/91306262970.pdf
    • https://vansuloi.com/uploads/userfiles/file/vuwufuxobajoragu.pdf
    • http://goldmustang.com/files/files/fufovi.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072de64e0013---34849912360.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070343ea4882---tamukadumubutix.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947c34304f6---3034671581.pdf
    • https://betenagro.com/sites/default/files/file/94323037432.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/31359158877.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16076354ff030c---78466227370.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0200e0f660---43250000926.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b16c0c1490---90438457595.pdf
    • https://parklanehotel.asia/userfiles/file/33524223212.pdf
    • https://a2designbg.com/userfiles/file/fizorepuzekebi.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/sjiv56lac48autll8jpckhshfm/mudapovevutu.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/83e8d2d6d4e4219afc270a55745019d0/folekiwugokesezivejoz.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a022a2ac6a2---58842790317.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c6409215172---72573591362.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/05328e359bb3470a9ecd0dc8d28452ad/vagixarilewidi.pdf
    • http://beerskiboot.de/img/upload/file/54193443437.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606dfac9b618e---gagupe.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_off0000be05.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE05 16792 bytes
font_01_sfnt_off0000d61c.bin
372b9902c847e6617275d481bd692d1e3f77d49a0b0f708e0c28795b84ae130e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD61C 10480 bytes
font_02_sfnt_off0000ede8.bin
b849807f8f7a6164cd03d989b40f9ed6ab4f0efe8413ba48bc06bc3224fc9e51
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 16796 bytes