Malicious PDF — malware analysis report

Static analysis result for SHA-256 f089de09e1b58f5b…

MALICIOUS

PDF

87.8 KB Created: 2021-06-29 07:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b967d9ff599afef50ccdb3e5b589d77f SHA-1: 3e43bf490e067ce57ba12f51b4bcde959a817c0d SHA-256: f089de09e1b58f5b5056a7edf49949a79137881e4c6f3ad365919212b1ca749d
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 sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3fb0cac67---wujegukakemu.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a234c1bbf72---donozuduw.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/6l263f0lia6f3q67c7lqo8196k/tanavirezebazeminututal.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/2ea20nf659vrdcuim2676qfeu0/buvakupu.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ctp3gs2h05htgea00m6qg5b9t1/13647861171.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6ba5d3909---42200600503.pdf
    • http://dunajecbiala.pl/upload/File/mogonaloxim.pdf
    • http://thanuyentea.com/ckfinder/userfiles/files/51396070012.pdf
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/vavamolibefevewatadej.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160706a7dcd393---79599125908.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084b7ef0180e---97941390616.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/520e17906da01b13c9f87b8631ce0623/zalenu.pdf
    • https://gs-hemeringen.de/ablage/userfiles/files/30930667474.pdf
    • http://a-kamen.com/userfiles/file/32461331316.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/3949b7a1a2edbf22471152d01e07d93d/pusugijijokeluzekidufe.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/cee6768b0dccd87a1fc3048543e9a352/ginusozopitovaboj.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/b969ebc0dbf668fa363d10ed6c1a6872/621932815.pdf
    • https://ajansnigde.com/resimler/files/fawojepuzoxenatozuvun.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba48010f97a---90072161190.pdf
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/47867463702.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa636104ef0---ludiwuwew.pdf
    • http://atut-biuro.com/uploaded/file/xurabazexan.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f18987258235df587c2fed2de1e43cac/57362892160.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ab33fee7520---34550827669.pdf
    • https://nepalipublisher.com/ckfinder/userfiles/files/dogododajoraxitogomev.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=treble+stave+notes
    • 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_off0000f4d5.bin
9c6b745521ca13ff36789ca8c3334505556b40f7a56268b242fc963980d4d384
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D5 17696 bytes
font_01_sfnt_off0001232c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1232C 16792 bytes
font_02_sfnt_off00013b43.bin
728ec31687957f4155a29bf649344f3b698b3e208260f2c0f37f4c5fe4a5359a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B43 10176 bytes