Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4df590b6068c619…

MALICIOUS

PDF

83.5 KB Created: 2021-08-31 22:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 37bae3f75d0e31f00d961f4f7e037f9d SHA-1: 4c590e5d3919868faea2e3ad032e371eb8d7812b SHA-256: d4df590b6068c619569cde4cc763da7a003a823956867c7d69cb7cddc057f3df
156 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bugskin.org/userfiles/file/nabuseverimopu.pdf In PDF document text
    • http://sethhukumchandschool.com/userfiles/file/84480723656.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/mekuxakodabavuxarabosu.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/14168959115.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/28128062086.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/dc7ce5c50702879beea6a03ce6bcf4b8/25654815788.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/55309688713.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/434a02e6f241b193e69c4cc0672e3769/17653017210.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/36867601207.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/3bf1b9f1b8e24d0b0e9b6117d4f84c58/74116233188.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/sirovazexizidavo.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/36045861505.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-8-21/20210821045545721363.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610924f7ec489---volisorezava.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/d645675cf508d734a9e6320922b46d29/18699973261.pdfIn PDF document text
    • http://mobilenmr.com/files/files/42972523598.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/79138488241.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/demabogorovepizuz.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/9afc6713e777a470a6f8dc4fdf6911f0/vibujivumike.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/mafufitadenikepesorazugo.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/kijesijutulazisu.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/torajexasozafasodarejiko.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/97808581721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=quotes+for+being+alone+and+sadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE059 18528 bytes
SHA-256: cc39b1deeba992936414d6c57c3fcbe822b550512bb5c32093e6834acd497732
font_01_sfnt_off00010f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A3 10828 bytes
SHA-256: 3e1bd998ca3f9d2b4e468410bc31c3f5308db294d5e0e9b653836bf6a57e53fd

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