Malicious PDF — malware analysis report

Static analysis result for SHA-256 715bffe388b06efc…

MALICIOUS

PDF

74.9 KB Created: 2021-09-27 04:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 198ec9d7ae65fb201dbfe7df3a21ee20 SHA-1: ca3ec4a4ac59eeb994a7b119423bd7f66f6f415d SHA-256: 715bffe388b06efc1e3179433e59162f6dba01e60440f27fa0410bab1d451ea0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to external websites, many of which are hosted on compromised CMS platforms 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 distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://laborke.ru/uplcv?utm_term=paranoid+juice+wrld+lyrics
    • http://fuerst-architects.com/uploads/file/15518925584.pdf
    • http://sys-svinding.dk/userfiles/file/jitowogumuwuwoxalixiwiba.pdf
    • http://argol-editions.fr/userfiles/file/69198289732.pdf
    • http://oa30us.com/userfiles/file/rezod.pdf
    • http://eatatrudy.com/uploads/files/dozitam.pdf
    • https://rsvforum.com/userfiles/file/ruloxofuwuludinazavasi.pdf
    • https://aep-tc.com/cache/fck_files/file/98216625427.pdf
    • http://www.masozilina.sk/ckfinder/userfiles/files/8259893922.pdf
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109051012429439.pdf
    • http://normel.org/files/upload/file/zidupikabivakugakusalo.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/grrinb2psl7b1mae6rl2kdnbj0/kotizevovedumepesus.pdf
    • http://tasarimak.com/ckfinder/userfiles/files/wumibixezebepunejug.pdf
    • http://sportingfoundation.com/uploads/file/fufibaw.pdf
    • http://ivankotov.ru/img/lib/file/sabosalinexujenobawapo.pdf
    • http://seoulgreeter.com/userData/board/file/talekusesugibotifonedofav.pdf
    • http://studiopedrazzini.eu/userfiles/files/rebosupeguzekesulatubo.pdf
    • https://elsa-daulte.com/ckfinder/userfiles/files/20776681603.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/4e765ab9ad0b640a1e2b0f08ae448958/rupup.pdf
    • http://sunriverps.com/data/editor/file/79211239540.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/6c6583b89c4fcceb09fbd40e98c58630/35165966145.pdf
    • http://summitremodelinginc.com/userfiles/files/98708088102.pdf
    • http://gruppocaminiti.it/userfiles/files/nefisinadenoxujifiz.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_off0000baba.bin
cb53ec417ea1f60cee0e3794c5ca86c0b8cc7b877e500eecd6cfcc689647dc52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBABA 19556 bytes
font_01_sfnt_off0000eddd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDD 16792 bytes
font_02_sfnt_off000105f4.bin
90a917ae31bcd7ffc32d1328ca91f65a968a8927a2248b664a69004064457587		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105F4 10696 bytes

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