Malicious PDF — malware analysis report

Static analysis result for SHA-256 db9f05043073b9aa…

MALICIOUS

PDF

86.4 KB Created: 2021-06-26 03:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5ccb883f29a034b21a4966a828f982a SHA-1: faffe82b8b02f359cb08127679105e53009fc315 SHA-256: db9f05043073b9aa4666cc9e1a30152479508dfbecf4510bef94ce6f1c67fcdd
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns suggest the PDF's primary function is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://bjbtrh.com/files/pic/file/jofovedekupesa.pdf
    • http://oaklandscreche.ie/userfiles/files/4912438364.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/e073adf1b49e3340a6eb6c3d1070b7dd/sunufakokarobidofapino.pdf
    • http://akkoryazilim.com/userfiles/file/nolekadololutenezobul.pdf
    • http://piau-po21inn.com/CKEdit/upload/files/58785402186.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b55d55e1995---55584635237.pdf
    • http://waelfawzy.com/userfiles/file/66231488449.pdf
    • http://orhs76reunion.com/clients/30721/File/basazejubuxuxerabolipi.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/jvpkloasi8ecjssnqgvhlr4s21/pirate.pdf
    • http://pincailight.com/zk/UploadFile/file/2021060701365273499.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/a87l7sgk77hd242dd6kqu04482/rakenotomupidezex.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607596898186e---nepokonozumobupup.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607912fda365a---63014485696.pdf
    • http://aivieksteslaivas.lv/userfiles/file/jesajisexomamu.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/b9c1fdbc299525a34642f50ebe65ac9d/2926873748.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/26r67qm8mk7jskf57ns1551043/bejolefugu.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e0fc765dd---17041033330.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/c24f60269c4d04324e38bb91f98c31ea/jogunadag.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a928aad89c3---58665744728.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098826f56102---mexasowofawin.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/69683139e18b51c23bb157db32406751/37474575308.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+many+usb+ports+in+ps4
    • 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_off0000ee44.bin
b37ca0cb6bacfe64c748c55a3d7c89680db6eb3f90aca101450a440b0048976b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE44 10744 bytes
font_01_sfnt_off000106cc.bin
fe06af3282fdf9454bced1db1fc762e5b8794ea4feeaa6b6d315c7ff2116e237
pdf-font-stream PDF embedded font (sfnt) at offset 0x106CC 17372 bytes
font_02_sfnt_off000134bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134BF 16792 bytes