Malicious PDF — malware analysis report

Static analysis result for SHA-256 a09129a5fae91dff…

MALICIOUS

PDF

84.2 KB Created: 2021-08-18 17:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99ac9c719a14215cd12a6c98e075d283 SHA-1: 0b937b3a2ab18ceaa6b2352e415956b07692b4ab SHA-256: a09129a5fae91dff18cd291dc0e8e247250db542756852bf410fc9d8d9c1cf78
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The document body is unreadable binary data, suggesting it's not intended for direct user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://rustproofingottawa.com/userfiles/file/lanilazufovibimuroresom.pdf
    • https://hahapediatric.com/uploads/files/202108171709308226.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837b8ce5565---fizowumakilasozagole.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/a8dd268b1d6d3b624366c9f011121123/30152168477.pdf
    • https://lesfeesdelhetre.fr/upload/files/wewifosafejuz.pdf
    • https://accuratesearch.com/userfiles/file/55063342498.pdf
    • http://gumberryoleschool.com/clients/33891/File/mojetejirejesoxikebo.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607860d81012c---47389941771.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf84f3f31f---soniboki.pdf
    • http://goodtraefarm.com/ckupload/files/vujowerawosa.pdf
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/55540633149.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098c435360e4---19384464491.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/0d6c13cbc0ec7faae237cb31f31672ec/46938849250.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab364d155c0---namezobubow.pdf
    • http://fractinvest.com/uploads/file/29311571945.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ppi9ngs5k9lu4g9qumitosp7ur/8154883381.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/sa7tiu7d0lh1du7o1r6at6869a/50278572809.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a1829b2cd8c62b41735372af32ce0a6c/likidofawoziroxot.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/f6bba97eb8d9d862adf42e3c8423c96f/bonumo.pdf
    • http://kirakuramenandsushi.com/uploads/files/goxafidezebab.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c51154f01bc---todoraru.pdf
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/logigalomabidomu.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827aeda49a6---76183910853.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/e15a5f58e6ab3acd8b8207613fdae5f9/pavolowegowozatatedasof.pdf
    • http://ecolservizinettuno.com/userfiles/files/naburaxe.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/8ceaa9bde6b2904586f7a9748ea8c595/35224936568.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=que+es+un+taller+educativo+y+como+se+hace
    • 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_off0000e1ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EF 16792 bytes
font_01_sfnt_off0000fa01.bin
b10d2b279eb3e1d4216d3d3919984e1de4d068bd829aca89b0ace371d5b68c43
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA01 17620 bytes
font_02_sfnt_off000126a5.bin
5be99a252afb7b2362ea04b758be052ee36772c35e2771975d0407fa9ffe76c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x126A5 10972 bytes