Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc84f7bceeb0e673…

MALICIOUS

PDF

86.0 KB Created: 2021-06-29 15:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31cf095f9a0a2d03d4d712c27f13af66 SHA-1: b35575df669466538e1cc4e352ea86f4aefc7466 SHA-256: bc84f7bceeb0e673fe1aeb2b4da2d0de18685fb2a43ccc3368f301e1fb091d9b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://rgn2u.com/userfiles/files/kugerumosasukeloropew.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/xakujozajexugopuxi.pdf
    • http://world-green-hope.com/uploads/files/66530526606.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/3fdffacc5857c7630ce7e5c71b3c571a/liseno.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160857b5186c0b---23996290214.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/2bf1f28e6cebf9ff7a739f8b071120dc/75261743598.pdf
    • https://avgdesign.com/userfiles/file/tufib.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094531735499---34028489422.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/9g7g8flc6ss8etr085am5c2sqd/46493804308.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a44c6936786---13629393740.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160706cee19709---lulolelipupixinowow.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7e3bf085d---31415441998.pdf
    • http://dochoiotovn.com/uploads/userfiles/file/lazidigizafiduxig.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc796d49f8---firarokasoj.pdf
    • http://broadmoor80.com/clients/866172/File/20663797969.pdf
    • http://alexlunacoach.com/img/editor/file/8488946097.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/63547952940.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/bevbnkufkl1m8tsn4grgg0ibg5/tufapakejajunadikakafutak.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b902671c2---dafogititapepiravib.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/8q4k8neq5srtuc8ktl1h9ng8j6/vikevefeperefodukig.pdf
    • http://alessandrobelleseveterinario.eu/userfiles/files/33072985171.pdf
    • http://cintabogor.com/Uploads/userfiles/files/xaxapolutaxi.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b66859ba176---12869212734.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f82ea6a50a---79222203000.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=game+rise+of+the+king
    • 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_off0000ed4e.bin
3db6858b673026102abbc0d35a4059cfdce037369f26043685e081d94a1fac16
pdf-font-stream PDF embedded font (sfnt) at offset 0xED4E 10748 bytes
font_01_sfnt_off000105e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105E3 16792 bytes
font_02_sfnt_off00011df5.bin
de577aa1be9aa1d216c721f01e5ddea369562713e6e7082cb79a76db783e689a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF5 16808 bytes