Malicious PDF — malware analysis report

Static analysis result for SHA-256 c408a5c033d73aeb…

MALICIOUS

PDF

93.1 KB Created: 2021-08-01 07:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 06552c0248cd0b67235dc857e671ac8c SHA-1: d39fcbff5c1a9a265dca5cfb1da4ef97577ce395 SHA-256: c408a5c033d73aebe225cd8798b11e5f1339ad72f66226e083e1f0367748ad9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c52b2a9242---37708281270.pdf In PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/0bd9b8563e7004f2faaac216a5e7f26b/13560539866.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/3eb7eb865ba865225626fddc20a9b065/65509591765.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9f54bbd2c---65675917203.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/38836750088.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/begevud.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adcdd3bde1---zeruta.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8115bdde76---zowuvakokinamivol.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073e65580e60---punevogadirumelilotezume.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/zodivuxumoxesajanefu.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/6dc196b0d5fe1a9b25b8da4605f92ea9/94643766062.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/kesemadabamojiwetaf.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/37830de418967c43e95fb681ddc7721c/wegikutodowe.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/99996580394.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16093cbf7cb9ed---sixirovirusilewamixi.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/vl5a59fc88ogc94pdiagq4tfb0/26411553768.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/puremunufunemazolow.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/4894c988426f00f8328fc230d93936f2/buviwopagimisasonopip.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/tgv5r20peai55f31qs5rl0bikh/givarosu.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/mijukasasi.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/91358149179.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/nutukumunukibibarofas.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608640a6219d0---69589682197.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079e6362762a---99119953953.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609254947b704---17255329801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+set+up+icsee+cameraPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC4 16680 bytes
SHA-256: 0002be04f105bb4f301aa9c095c4bc523a06b81a64f3da9bdd75bcce6ccc4123
font_01_sfnt_off000135c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C4 10560 bytes
SHA-256: 82363446a8d27081c031549e81f4fd92f5060ba6b5c18a82969d822d8f5b3c19
font_02_sfnt_off00014df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1