Malicious PDF — malware analysis report

Static analysis result for SHA-256 93825eff6ccc3fd7…

MALICIOUS

PDF

94.8 KB Created: 2021-09-07 07:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00cf4c530182de43563e624e6eda8d18 SHA-1: ff1dce8556bc2d59d493a3d9e22d537cb16c30c9 SHA-256: 93825eff6ccc3fd71b877a9387915ddf8b3d7ea27a2f77239747c01f1c2222fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://vegas-shop.net/uploads/files/rugadurutaji.pdf
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/14303509515.pdf
    • http://ehs1958.org/clients/73155/File/80389287681.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070859d9466c---lusefuwewavuluganon.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/372d4d171b9f9321646b4802fca9dd36/39355675342.pdf
    • http://ohmamakitchen.com/uploads/files/nabom.pdf
    • https://verticala.ro/images/userfiles/jopunoz.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/280e4bab7ffe6203f50f8f95e5866ee4/sorujet.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16126ba92e9912---44615102906.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f666b03e7---58886564450.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161334e4dd0a08---67845276283.pdf
    • http://benthanhsgfarm.com/images/uploads/files/sivewixotoferonamiza.pdf
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/tugimulexogob.pdf
    • http://accapierre.it/userfiles/files/89931490190.pdf
    • http://nomayaku.com/userfiles/file/68486448767.pdf
    • https://trimix.bg/UserFiles/File/pebojasetajuwuxez.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1611c57ec5e495---15726818066.pdf
    • http://vietsinphar.com/uploads/files/70143171317.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/561d8a050f0c8c5f9747bdcdc8d5c484/86960504639.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccab35c1ba---gorotaterikepovutafonov.pdf
    • http://ever0036.com/assets/uploads/ckedit/files/20210621032507.pdf
    • http://nepalbestcargo.com/userfiles/file/xasojevutujizatunof.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612536ba5ec60---zojovakozijir.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=transmission+line+theory+tutorial+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_off000106ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106AE 16792 bytes
font_01_sfnt_off00011ec5.bin
3c8ec7e405a863cade0e43c8fa91ff2b0a6c2a1b71fcc21b661b4fb724fc51b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC5 10940 bytes
font_02_sfnt_off000137ed.bin
1960d9f44e1d8c057f99f6fed1d53c9a37fdff4004a06ee9d00ccae35637c7a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x137ED 20144 bytes