Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e62357d287e5a0…

MALICIOUS

PDF

85.1 KB Created: 2021-08-12 17:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 119ad86b8f49e3e3493fad2a5a955490 SHA-1: ef5ec0dcdf6212348d1952f34416d7986bac8dd5 SHA-256: a9e62357d287e5a062cd2de3b32ff3f9b002b15a29ffeb4ab608f81f7a388f9b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of 'cmd' tokens in the document text, alongside embedded URLs, points towards potential execution of commands or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://mdc.ir/ckfinder/userfiles/files/xesiwaze.pdf In PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/a0fmuigfgj12aidcmd9ruu6r9e/kuluzatotivapaviposele.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/98466183143.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/22091655705.pdfIn macro / runtime command snippet
    • http://agiusfuneraldirectors.com/files/file/potimowomadivozi.pdfIn macro / runtime command snippet
    • https://mobile-translator.eu/app/webroot/media/files/95388521603.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/bumanibapew.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/pu7ntdnm62mmo9218i8uhtgh2c/47435906901.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/12008261295.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/83217969843.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/voguderagov.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/88420477544.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160788c779df94---vanuvipalapegi.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/donufigewe.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba15ecba64---danapibamurixamoreb.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b78d2997ef---bijejazitabu.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/gudumelavenesumevofok.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/fozalituxapogofejapuw.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/lepopogakajemakowobo.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e297c88bcd2---bibojekerimurelix.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/207408692.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/33852921223.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/tboqdf4p4tl7s6uq0ictjkdbgm/mipefaguxedudasetepow.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f3279544b---68589748876.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/cf2153a66867b631d8c51eda5078d776/9135886617.pdfIn PDF document text
    • http://dralituncer.neIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+preheat+a+bella+pro+series+air+fryerPDF 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_off0000e753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE753 10680 bytes
SHA-256: 62caf327f10376e633fda430cb9f1efff290024b729eb3275542038af3c150a4
font_01_sfnt_off0000ffc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC5 17580 bytes
SHA-256: 0fa4d399babb9b9980c0b60cabc310babaea783f96a58b792e36491d55e6860e
font_02_sfnt_off00012d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1