Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4186d98051552c…

MALICIOUS

PDF

84.4 KB Created: 2021-09-05 13:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ee910502c3a1f71696c32ef80be9d916 SHA-1: aaf1a6eac19e89b3bef1cb9cdc35899563030736 SHA-256: ac4186d98051552cb1280d85384e16750c8a7adec0d86a5e444025b84931bf93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=surah+e+kahf+pdf+free+download PDF link annotation
    • http://loaamtran.com/files/usersfiles/files/kafupugus.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/vanukofitizoxubemod.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/nobugutiriku.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/34790363607.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/tasafagulemajepuniw.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086a84cb715e---89517889159.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b85e2452f5fa3ae25a123429b34159e0/59862480478.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/e765e441987e7a79a06801c41a580e62/10347208717.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/68585075696.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a48676b6d---67776407348.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/30084440328.pdfIn PDF document text
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/62124493449.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d52d0205272---56161393874.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/a80586c15652f48d161defef861933bd/zixazitajerosakulola.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/tafizugoxixilasa.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fde886941---lamagikivud.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/6a2a84bd1595342031b5f7de0c421099/dudixiva.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/monujefoxukimepilofidize.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/talabizinevaxopogigot.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/vozul.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/40080117909.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/ffb7d1f39e683a786ab15512584778af/daguvazoguvesewofaxemixa.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efdb654566---xezodarekelizuzipifen.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d2699676725---donerewolapaluzi.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/170414166.pdfIn PDF document text
    • 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_off0000e185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 10592 bytes
SHA-256: 6e829877aa94287434bd09be08d962ba2910b8891441ccf31c04741e75bd4270
font_01_sfnt_off0000f9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 19228 bytes
SHA-256: 7e6e05bdbb4a042c3daa0bbb453c000b3de8600f27b2db9cb5822d92e7386902
font_02_sfnt_off00012c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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