Malicious PDF — malware analysis report

Static analysis result for SHA-256 0397c15dccd55858…

MALICIOUS

PDF

85.8 KB Created: 2021-07-09 12:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b654f848b759480d43c1ccfa05d501d SHA-1: ebb1dd30628e86dc35070391f754d32fb94e6492 SHA-256: 0397c15dccd558583879c7960ad0fb4378c986c1ccd694d429a141f391293e94
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crewmak.ru/uplcv?utm_term=hohenzollern+castle+layout
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/97888373050.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083358ec7c9b---80464288422.pdf
    • https://hitpoint.tw/userfiles/file/69445367577.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/97d84e04e0445ef931c1942a7102f7b3/domurebesazasajixipa.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b86bc0924b9---sipawiwejurelarowovisu.pdf
    • http://sadiqandsons.com/userfiles/files/fidopexovefeze.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c4aca8cf6---femalatetutaxivedegekeba.pdf
    • http://cnokorea.com/userfiles/file/rujawikerez.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/2b9372bd0e9f41c9e343e17ec23f0220/190357152.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/4c72dbe34beaec19bba3e67906aac580/91082767078.pdf
    • https://goldenapp.net/file/jiguzefebiwesit.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6e1c4ea6a---14779857275.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6217aad9c---velatanodomodiliju.pdf
    • https://tkquiz.com/userfiles/file/zapinipuwekit.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cea5f450c7c---lowewologemex.pdf
    • http://keysrotary.com/clients/d/da/da683cbc30bfd632b0b364d14bdd38fd/File/nadovilogibufowodixasa.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a7b1478c4---nanipojisoriwesame.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/549e26dd62b998b7c1d0952bae1afbbb/panexasegulakisibaziw.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/29559193506.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/afkv2u3lal95knr3oiv4aobtu2/teweruzotuxofiwuvixibi.pdf
    • http://azizolace.cz/images/file/vamilor.pdf
    • https://resonanceacteurs.nl/userfiles/file/51772719462.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/802b57a94073f6566c513f29b5fe6624/fedosagoxufavumigexep.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee0b6f16c3---xasojok.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb81a121c9---ziwisekigolijeze.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_off0000ebf2.bin
04720a36de5bebaf3fa2a9e2ca082ec677d5777d2cc9269a8b19abd9385e2a54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF2 10500 bytes
font_01_sfnt_off000103d8.bin
9e0b08a1e0ac08498ad0f0f1ee64481e61868f66c85997573c504bd193f33c7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D8 18032 bytes
font_02_sfnt_off000131f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131F7 16792 bytes

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