Malicious PDF — malware analysis report

Static analysis result for SHA-256 479bc870e021af74…

MALICIOUS

PDF

83.6 KB Created: 2021-09-07 13:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd3e0c50f85da8dc11b191b9f321f1a4 SHA-1: 2d449497566894dcf7eae064000ff9a4482d4347 SHA-256: 479bc870e021af7405aef7ac93200bbe855111ab3fc81c4c130cbfed848d20dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://turagent007.ru/userfiles/file/fosiwanirulabuxotanawod.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/8407f9bc61e4798461eadf43f5d1376d/13489512535.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c524a1169c0---87806630549.pdf
    • http://tdvvietnam.vn/webroot/img/files/73018093044.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/vh29hvm4s69patp73tdhtcsqhu/7259466349.pdf
    • http://kelkenaghshband.com/app/webroot/img/files/vosinelodinu.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160722d1a3903a---sabaxesoneposarefidonuz.pdf
    • http://alarcon-v.com/editor_upload_image/file/jatesufuwoximezunune.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b0ae25723---28414187046.pdf
    • https://agrilaui.com/userfiles/file/18496225764.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d174f31a64---vexakunomabutesavasi.pdf
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/nafapomupur.pdf
    • http://ahsaipu.com/v15/Upload/file/2021429833397050.pdf
    • http://serdceprirody.ru/userfiles/file/54742926087.pdf
    • https://bdata.vn/upload/files/84551165208.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/lqduaeb5qmv17971a1c8gienk5/tugukaripavugifulo.pdf
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/powasegu.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099efe74f4da---35314676533.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/988bb2af3e08ca0eee35fd5f44dab0cb/kotexutekomesokijujok.pdf
    • http://sntaviator.ru/ckfinder/userfiles/files/sotugoxab.pdf
    • https://www.zolmedis.lt/ckfinder/userfiles/files/85702852326.pdf
    • http://iccjsc.com/images/uploads/files/welegosedoxiveb.pdf
    • https://szabobuszrendeles.hu/files/files/zuwipoxizabijafi.pdf
    • http://nail-free.com/ckfinder/userfiles/files/33973808704.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/7fe56ede471f0489e32b6a0ae7234e8c/89792961711.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=wyckoff+course+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_off0000e0ef.bin
45db31b7e0fc3aa90d203c043d37b5b7bbe4f0783b6631982cadde960b321709
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EF 18364 bytes
font_01_sfnt_off000110d6.bin
6b1b2de830f262e7fd456c77cd7878eae5be1b496e06b50ae12210ccb5df404d
pdf-font-stream PDF embedded font (sfnt) at offset 0x110D6 10412 bytes
font_02_sfnt_off0001289f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1289F 16792 bytes