Malicious PDF — malware analysis report

Static analysis result for SHA-256 65fbca1082168599…

MALICIOUS

PDF

95.7 KB Created: 2021-07-04 19:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4153a34a0ed6559c7208577d98fd696a SHA-1: 98fd0e70d8b3ffc1d14d39c3c2a5edc2716560b8 SHA-256: 65fbca1082168599f4c7aefa55892e171d14460d79c79a923c3333d7b7bd8836
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, serving PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm on potentially disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855148704da---jabepinolefibamugezudiked.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aac22e152b5---94806710619.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/vhom4krii88b9e0l51jp761q23/97971042056.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/09450215a44006a11b14dfae6e7e4543/tigijutemolodufevetigu.pdf
    • https://amitadevnani.com/userfiles/file/lejaduv.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718ae146e72---vukilidifu.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/59c7c6d296de7fe7af5bca6ed9a5ef09/lubegexasejasukono.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f9ed71bc1---1175987040.pdf
    • https://hpsoft.shop/upload/files/jevenadeziduxonugetu.pdf
    • http://drairtools.com/ckfinder/userfiles/files/83468393498.pdf
    • http://kolesnikov.pro/ckfinder/userfiles/files/31191393630.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a8dd99f8383118d028c7ed8739136cab/faboxemugikureve.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/caa911c4da785a8cd24ce75e4992ede7/33210330650.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608662fe90e3d---42349039757.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5f68c88a1---9240602457.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d683688250---sevune.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/318e4e882c65940f91110d2b4db78094/95039644302.pdf
    • http://udaybharat.in/ckfinder/userfiles/files/wukulagurusetenuvus.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace43c387f5---15125629821.pdf
    • https://nepalmicrofinancesummit.org/userfiles/files/81814336638.pdf
    • http://sequirk.ie/userfiles/file/57126662804.pdf
    • http://adveotec.com/img/file/85688951130.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c85db3569b5---49208596529.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/e77a315830e9d28952c27a5a36d843a1/jipatixuxupuwa.pdf
    • http://bpabv.nl/uploadfiles/file/wipuzep.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=what+is+the+collective+noun+for+mountains
    • 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_off00011458.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11458 16792 bytes
font_01_sfnt_off00012c6f.bin
7eab199af1d4c570ac120d1df2bb0d7643a126dcd686095952c83e4fbb99a506
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6F 10760 bytes
font_02_sfnt_off00014504.bin
2b0b08154c8a90a4901cb66cb14354dd45dcdbae9c0abe3d25d01b054ef431b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x14504 17020 bytes