Malicious PDF — malware analysis report

Static analysis result for SHA-256 89e367d40a777310…

MALICIOUS

PDF

80.9 KB Created: 2021-07-01 16:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d855535f2f81ae82ba947efe8249601 SHA-1: fdfed393c3ba9bdf772d83e353037c542875a133 SHA-256: 89e367d40a77731088424f03e15bcefa3ea1e21e0151d83dba63d2e3ec3b3fbd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress sites. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the structure and embedded links suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • 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://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d64b941fd23---valab.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086906e72b55---juzajovos.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/9kq8n192nkr4eht1reoontg7bp/fatifopuvefejori.pdf
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/xifozokawokirivazu.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8738a7f3b---2001191644.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cb051f90f---nuzetadadifa.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21967b4b59---vizoguwe.pdf
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/f8967vt098msv7c3oprc1hj0eg/tipusopevuwedixikaw.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/e9314a6f263a236ed610b1f17011380b/1459512892.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c61a630653f---21028947098.pdf
    • http://doo-san.com/userfiles/file/20210609021425.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbcd96f356---11172633672.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc25d247f62---65758085855.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e863aeef9---dofinolodarugol.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070488d74629---59363904214.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160942012d8e61---tosulerakirugejidoregud.pdf
    • http://www.conectadoscomdeus.tv/arquivos/file/80432126880.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/977ab6d4a7e302c30388b1ab5ffbd4aa/63021303674.pdf
    • http://vejwun.cz/images/59117405701.pdf
    • http://ddgasul.com/userfiles/file/17237422919.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896cdf2f54d---tamumumovatifilapevesem.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/97c4f31a15a3f6cdb6d2ad6a38b40712/fewelozixe.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/f104442a49a686a2735bb9282da7c2ff/xipugapimazavikeval.pdf
    • https://wendi101.com/userfiles/file/danafi.pdf
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/kubagajoju.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fc4036c33---sorakolafitubabut.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=solve+single+linear+inequalities
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ca9a82a93---87758070889.pdf
    • 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_off0000d801.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD801 16792 bytes
font_01_sfnt_off0000f013.bin
e126131ae38ea8f3e1f4204445f8638d2b643f1f24d1d2a471e66f2c9f579119		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF013 17252 bytes
font_02_sfnt_off00011d87.bin
e4b09e825cad7cc19971b48d9adbe806eba30ab56540ed46f1df01a0ed57c742		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D87 10672 bytes

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