Malicious PDF — malware analysis report

Static analysis result for SHA-256 a915c80ca07d31a2…

MALICIOUS

PDF

70.8 KB Created: 2021-06-27 11:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1bee62fb42bf84c8aeb196d1e19adbdb SHA-1: 20a41fd04d6b7c5dcd0d47a9dae6f31cfff75d61 SHA-256: a915c80ca07d31a295430c0ab6f4991309a9e794473fe061985f95ef7526cc1c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d081c72074---90956029859.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/793bdf9b72433412af63eb43d453f391/jusirobek.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b65b9797887---32274494927.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/0cce7ce99c324c9c5c4b136cb703e010/lobuxowamosupejewadodisan.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/c5d85b9c6a35af2e68ffad9acf98edb8/jomutufuxewowomari.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/ac5757705713c1bf1591ecc25f2dc6c0/loziwof.pdf
    • http://meyergarden.com/ckfinder/userfiles/files/58217712559.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/1a2502df1764663e1c974c5680fc2b94/26021772979.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a0d90ea91---73670874206.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ea6841d67---xagaluwositanazaxap.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b347a24bf---wakabuvevazetita.pdf
    • http://moyamoya.center/images/hand_uploaded/files/14339635768.pdf
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/75914397089.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d9820a376---12610187779.pdf
    • http://noahjohnsonsark.com/clients/e/ef/ef24418f2336b9480f3353ee42fa3f58/File/10530068012.pdf
    • http://acecaalcoy.com/userfiles/file/86628625260.pdf
    • https://communeouchamps.fr/userfiles/file/99793391204.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b2d1e6f5f---mamovisateb.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/39190495.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/uugnogk88ejlhvtdiupe9en057/wosanoxajalozanufido.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2b0b75773---36131823085.pdf
    • https://bilalyapidekorasyon.com/userfiles/file/movugelajapinumugu.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f45a9e396---17023152419.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/3c7438548710421cc149f4b056b85ddc/61394210625.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=what+is+a+lamb
    • 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_off0000ba34.bin
582e27a996b515908a704cfb0242ee542d37ab814bf4ddbcc548a0cfc0729041
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA34 14736 bytes
font_01_sfnt_off0000dfb9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB9 16792 bytes
font_02_sfnt_off0000f7d0.bin
0c1f4c0edeae6a7913a5f57edf85fa1b8702bdf1cd8f49a9e91a7121a6102cd6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D0 10048 bytes