Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa1db87db780446…

MALICIOUS

PDF

86.6 KB Created: 2021-06-30 10:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d47f87d44493392c9d988ad6d9d23af3 SHA-1: 2e65e6031bb36107679d19fbb9918fab19bfb5c0 SHA-256: efa1db87db7804465847a6eef75245c350880eb83a90e1373d479c325fa8ae06
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads 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 delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://criminisiepartners.it/userfiles/files/xedep.pdf
    • https://harrisitalia.it/uploads/file/12465615091.pdf
    • https://honghow.com/ckfinder/userfiles/files/1087668426.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/0b232c6b3916245878d2fbc18f41c83e/medibebetadogumapuxekej.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/88024893243.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4182154f6a---zawutabipovirizazaliledo.pdf
    • https://krono-original.vn/Images_upload/files/64941381586.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/40d38391eec23d35eb9393da0ab897d0/28818572884.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bced4de1315---vorexegusaz.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c5ebb5179---73513828300.pdf
    • https://campermagazine.tv/public/file/fifowitarujemiles.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607747727fba1---galejupobiwaz.pdf
    • http://weclassof86.com/clients/6/6d/6dc59c75684a9be5e3a4726337e2fa3a/File/8064391926.pdf
    • https://cottonweb.net/userfiles/file/25460246013.pdf
    • http://aimic.com/userfiles/file/99047215248.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d77b4b55231---moximasazudifivaxizonada.pdf
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/kawujuriv.pdf
    • http://cn-daomeng.com/upload/userfiles/files/266ed4edc333db3994934744a3f19078.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609217f1cf030---50808482615.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec0378d58d---1585740454.pdf
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/tevanurozawekudar.pdf
    • http://antwerp-reefer-tournament.be/argt/files/67106931501.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/9d4949d323ff20bbf65fb5e5666b11e1/11570459667.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/28033f2cd4538ddd2fb81fb0604df34f/misixapovuxatibadal.pdf
    • http://aloeverajuice.cz/files/file/zuximowe.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/4v4tndvl8ufk81t069d8ktjehn/90400792831.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9183ddda0c---jemawufesafor.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=waive+off+payment+meaning
    • 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_off0000ecc7.bin
eef4b6b40cdf68db686e841be72190e5c938c170c79165d7991e5394709f44bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xECC7 17780 bytes
font_01_sfnt_off00011b3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3B 16792 bytes
font_02_sfnt_off00013352.bin
079e02438ac5a3bc5453282376c6afcfb8c4c50c815df4214a6b69334e32369a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13352 10560 bytes