Malicious PDF — malware analysis report

Static analysis result for SHA-256 d748f5707f40ccfe…

MALICIOUS

PDF

75.8 KB Created: 2021-06-28 10:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56363be4e95e2338a29cee3a77edfbd5 SHA-1: b663872c43b83fd89365c9df24c67cc13b420129 SHA-256: d748f5707f40ccfe0f6e4e3236522dee6d4849113ccf8a69d1982ead0624c77f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://madang.eu/f_pds/fck/file/mewiwudipofagafumamewut.pdf
    • http://hb1004.com/userData/board/file/refuwibifikij.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/b0736a38cfdac0b30d21db094461428b/sisunobowadejusaxavejig.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c926a1cbea1---1946875136.pdf
    • http://petra-dario.info/upload/datoteke/40583198768.pdf
    • http://presssimayeshahr.ir/pic/file/99273171452.pdf
    • http://usarsenal.it/userfiles/files/fojofumixetudamox.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/cda5756c6b1ae63f9aacdbeea77690f1/80794422905.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abd86f7ec0f---fetopupiwomawuzove.pdf
    • https://hitourkorea.com/FileData/ckfinder/files/20210603_A166012444C58293.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c7face3b5c5c60580c9814d440d5fc08/joroful.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160828ffec0e4b---5021244142.pdf
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/60745912735.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/5862f813441edeb85eee7dfccb783930/94889115457.pdf
    • http://medica-brno.com/files/83177416879.pdf
    • https://triosms.com/userfiles/file/nujenirito.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756ce2996b4---bapolopesebajirupavas.pdf
    • http://metabolit-plus.ru/files/file/kisokuwenapepeduso.pdf
    • http://sivam.pl/files/file/xenitawigawefalorebuzodiz.pdf
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/21735154985.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a549c229---53621012529.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=fill+in+the+gaps+with
    • 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_off0000c894.bin
f34f04c3df7a83f7aaf99d2874962b55f962dba16d2c992a2aad49853c8a2769
pdf-font-stream PDF embedded font (sfnt) at offset 0xC894 16356 bytes
font_01_sfnt_off0000f30e.bin
d63e31f5f5b33cd44a021f21d4f1908d5e57e507e6bb74871ef442f00962aeb8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 10376 bytes
font_02_sfnt_off00010a72.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A72 16792 bytes