Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c361654484ef66a…

MALICIOUS

PDF

98.9 KB Created: 2021-07-01 12:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 23276eeb450a7546e3b6a547b7360aa9 SHA-1: babc072d851859a747701d958773b39a962d90b1 SHA-256: 4c361654484ef66a08794374f4e9a0e7297ce1fbc765d8e8ce97e3a4b82905b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the document's purpose as a link farm on potentially untrusted hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=the+chronicles+of+narnia+lion+witch+and+the+wardrobe PDF link annotation
    • https://anup.bo/images/files/dufin.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/92164920442.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/74029821831.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/27576085179.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/wezotesabosikivuniguv.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0d443f41b---55828744985.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b64b5a5ae0---84190111323.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b16fdd9880c---47087872176.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/53180870086.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/nizazeraz.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/5dlh3rq7ep9p3pa43vqobb0c9m/79517049361.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/42950278941.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/h2nut78cb1llg30pjgbqft2ct2/rezipafadebejotidaro.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/e5e5312df4004b353016bdcc6bdd8947/38814170706.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/lakajosezabapagegesak.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4d9a2a159---ponumorerakixedimobikitav.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/5968eb54392f805e019e019765e3d5c8/9259369359.pdfIn PDF document text
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/gepujajazo.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/b97fba0604a5a013e59f892087c6dcf5/zukipajisepag.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085beaea8a86---12619581794.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607086d9babdb---84548707060.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/77885899741.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/84761206713.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/42136622534.pdfIn PDF document text
    • 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_off00011c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001342a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342A 10764 bytes
SHA-256: 140fb4bc7001c6ddd8a4710cec0f26623a70f9d604d576f06649c421bacdb717
font_02_sfnt_off00014cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CEF 18504 bytes
SHA-256: 5bc4501e4a11af53c463e6f7b2f489fc21fc4ce1bab7e9cd137a251c482db867

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