Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b05427f5488777…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 18:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01f422da5b5e9d135f5b4c4a9d89f45b SHA-1: 0347a21d5e48dea987b531e3d0eaaac0134147fa SHA-256: 08b05427f5488777827a994ca4be7b3a195dc21c7c5a191b6b6622fce090b33c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous links on potentially compromised or disposable domains. The embedded URLs, such as 'http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e4e7ff45---bezibegagotobesapopuboba.pdf', likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://accesoriosalmayor.com/images/userfiles/file/23360268522.pdf
    • https://ascinfratech.com/clientprojects/trading/file/majuwagez.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d52dd71b1de---49489733929.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/80781760089.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609af82e698ae---xetefuruzuzi.pdf
    • https://rgcsmt.org/ckfinder/userfiles/files/69832707709.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16098cfa3c8c6a---65839041812.pdf
    • http://buydecor.ru/uploads/files/14250110209.pdf
    • http://garmagostaran.com/Upload/file/zulapazanatopejibulosif.pdf
    • http://shield-in.com/userfiles/files/jovuko.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/8df288b0ac2ae1974066390b93b37225/59776496023.pdf
    • http://compufoxmail.com/userfiles/file/39994082815.pdf
    • http://eurekaloggers1970.com/clients/a/a4/a4917853023b9a70bc4506ca58f09c65/File/puxufoxufawarasaxugokipu.pdf
    • https://diphong.com/uploads/41201038193.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4e48522ee---54910907183.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e03a973de43---gogelepepunipekazidi.pdf
    • http://teenmag.cz/userfiles/file/zuxilu.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e4e7ff45---bezibegagotobesapopuboba.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904668c3a18---zujepubesosexi.pdf
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/minigosagelaxupaziri.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610e838e1c48b---63939779032.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=individual+release+form
    • 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_off0000e0f0.bin
f2dd7d4e02a642e9115b9026ae098ef1c35264e35c2ebf2a4cdbd9709d7cd1d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F0 17268 bytes
font_01_sfnt_off00010dd9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD9 16792 bytes
font_02_sfnt_off000125f0.bin
bbdfcfe2c222e5b336cdb2876b61cd9bc0a5170c0c6ce16bc2b7cbbb235bebcf
pdf-font-stream PDF embedded font (sfnt) at offset 0x125F0 10536 bytes