Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f689801565ea1a…

MALICIOUS

PDF

86.7 KB Created: 2021-06-27 19:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a03bea7ea8a4fa017e8ee197616ddc4 SHA-1: e3a0d8a2ce154377133a389db35f40e68ec54620 SHA-256: c9f689801565ea1a711d52097d0f54755d59dcaca182c6dc51e8a74a66fefe8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm hosted on compromised WordPress sites, as indicated by multiple heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the link farm suggests it is designed to redirect users to malicious or phishing content, likely via embedded JavaScript or other exploit mechanisms.

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://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4dbd46abd---zubijal.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7a65737a9---tolifonatewedawazabato.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609b502bcf540---69297816854.pdf
    • http://studiorinaldibedin.eu/userfiles/files/joperez.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/uu7q0u25q8kvcjjal1akvchmpt/jixupotiwegoj.pdf
    • http://artecgroupservices.com/imagenes/file/sivomejeraxosiveloguzun.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/080057fea343d1f7b8154200171a79b4/59315967743.pdf
    • https://zanhotel.ro/beficientconsultingFiles/file/xozetarupekujituw.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd7f6bdcc---91537929632.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609203fc9ce0e---14123060006.pdf
    • https://corghialberti.it/file/95626716661.pdf
    • https://evergreencans.com/userfiles/file/87674431296.pdf
    • http://bagumul.com/file_upload/spaw_upload/file/20210513151719.pdf
    • https://aquatrustfina.com/userfiles/file/kumeputewexowi.pdf
    • http://sbnjl.com/userfiles/files/31697760395.pdf
    • http://allaboutdowney.com/userimages/vovojifagesurupekozeduv.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a141194f26b---jokoso.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/0ihm4o23j229d5etbmsr1rh9hs/56171380273.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160babf1a1e661---vobufagijasuduxinadira.pdf
    • http://hesexpo.com/img/editor/image/file/watetopuxudadoro.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/cf19e75f66943fead53c043ba700e80a/guwatalosozu.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/b0830f51085d154449e5762c2958f934/93320921275.pdf
    • http://dzbnf.com/upload/file///vanoxebisoweneragupajak.pdf
    • http://timeyear-v.com/userfiles/file/82612810604.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=associative+property+of+multiplication+definition+and+example
    • 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_off0000ec98.bin
59c9cb7d5a3c8db7c86b332407619f741c96c54e8f97f32d24fb89d9bd223268
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 17016 bytes
font_01_sfnt_off000118a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118A4 16792 bytes
font_02_sfnt_off000130bb.bin
b510b8c9b0779c742e47568ce8258bdab04693b4398c6c87ba812d6f459d08f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x130BB 11144 bytes