Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7179a28e5c55aa9…

MALICIOUS

PDF

314.7 KB Created: 2021-07-16 08:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91e2cd977013e06a4a4478d9e7a00262 SHA-1: 6c1e02528098b60f26e55b3186129fee4cdd8820 SHA-256: e7179a28e5c55aa9538f20e9488c6af831f6debc74458bce6ad83b2f4e767614
174 Risk Score

Malware Insights

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

The sample is a PDF that leverages compromised WordPress sites to host malicious files, indicated by multiple PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings. The presence of 'CMD' in the document text, coupled with the ML classifier and ClamAV detection, suggests an attempt to execute commands, likely to download and run a second-stage payload. The URLs pointing to compromised CMS uploads are the highest priority IOCs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9774

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737172249c0---77834142121.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dc07920b5---divemorevurami.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16089726b8a397---rakefo.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/82ef94b7caaf698c3b6adbe7a9c131d3/21653308234.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e10eef087---gitexivijelu.pdf
    • http://utpcomp.ru/uploads/files/dudifisofedutovufuratara.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/aaab4929052090aa96d3460038e3b03a/26150843747.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785ceb79799---libepolimulaxuti.pdf
    • http://alliance-ic.ru/uploads/file/66905843870.pdf
    • http://dogninja.com/userfiles/files/66814524971.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/263240740cfad16cea85ba130ab4b25c/xiduvovuvejojaxasibo.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/ab0437a4620fe94a781917162253234f/putupanuzedowerep.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffa32a1d8f---febuk.pdf
    • http://biirbeh.mn/images/content/file/bozigeluleripalesuputij.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/6558d88ce67533d0adf7a77cde651412/megapuvurirugavi.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ab53ffa08ea---42613770819.pdf
    • http://mesamiesdallas.org/clients/e/ee/ee8f1390623de39be1ac2b47a321719d/File/jomikunij.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/2gr6q982u1qjlsurs2fhqvjkg4/14477278645.pdf
    • https://aljuboori.com/userfiles/files/sotozodabiwepunew.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b91054ccf2---timulazi.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/4d47c424314bb5a2d747d128a930a3b9/35942033677.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/a38e90b2cb2cd42cdb4144ddb638bed7/womovawawomidepuvej.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3a7ae6d6d---3300452338.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe3e741ea3---25435616056.pdf
    • http://autoscuolecasetta.it/userfiles/files/wegufopunadure.pdf
    • http://waterlootour.com/FileData/ckfinder/files/20210703_8CC086C51BABDC5C.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=watch+dogs+ppsspp
    • 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_off00047559.bin
8a57a1c174a3eb29b0cf4ba51866085ee619d51e4bd393dc1c1acd97bfddde52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47559 10312 bytes
font_01_sfnt_off00048c96.bin
316692a43ee4b521e75a5df43e8c562bffcab8e4d948ba4ae46e11c4aaf32453		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48C96 21328 bytes
font_02_sfnt_off0004c446.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C446 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.