Malicious PDF — malware analysis report

Static analysis result for SHA-256 929712b9e7a949a4…

MALICIOUS

PDF

86.2 KB Created: 2021-06-30 08:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c825b3e21d894b0a675524ac166751c SHA-1: 885e664d72c5bcfd8cb23aa2b6a4ad9d5797b1c6 SHA-256: 929712b9e7a949a4183663b50d5c96ac332769702d76c4253d6b5b34ee008757
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/87698758043.pdf
    • http://farmaciafici.com/userfiles/files/rowidujadokagaverawizadop.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/82979aae294ee7d5a06865eb45e2fbf8/lopuninumufivitoxipesol.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5bb0800d0---55093039041.pdf
    • http://rheinmotel.com/userfiles/file/52826833226.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af31c08226e---xabidusi.pdf
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/kakerudaliketir.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076750ddea3e---kezize.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b35645f0c4---50996893105.pdf
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/robepugajegaroxepitabi.pdf
    • http://minipit.com/data/files/fabexalunirevod.pdf
    • https://bnbcostaverde.it/userfiles/file/10717328161.pdf
    • https://vydavatelstvoklett.sk/userfiles/file/54631632160.pdf
    • http://taikenplan.jp/ckfinder/userfiles/files/46344879448.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f2af05f5a---lemibekegeji.pdf
    • https://panama4d.com/contents//files/92092457368.pdf
    • http://prograsifkalip.com/files/57045874650.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/2a321a0df61f294f851e0fb12a9e234f/15042372438.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160939fd7bbba6---lozikazixa.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/cacee2897e5a38a0e7ca93f75ffc16aa/18026147537.pdf
    • https://cambodiaangkorhomestay.com/userfiles/file/libeziwa.pdf
    • https://soyana.de/js/ckfinder/userfiles/files/figubizimosowi.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607200ede4431---37015302563.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cb699beb4---xosavixapigelukinifemugo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=find+the+unit+tangent+vector
    • 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_off0000ec6d.bin
9ce434aba212fedeec4704f2c54ff45feffe423ba7f9b066bc3124b0ef68edf5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6D 10580 bytes
font_01_sfnt_off00010447.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10447 16792 bytes
font_02_sfnt_off00011c59.bin
1ea7ec8c94a24781b6f23fc76aeb1145fa11373164c950f0bdc1b396cdafe6d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C59 17964 bytes