Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99d5a611f8e9bfe…

MALICIOUS

PDF

77.7 KB Created: 2021-09-06 17:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2ce139c02c98f052fdea6348128bb217 SHA-1: bb3b60f8a0e056504391d75358941a438a224ec0 SHA-256: a99d5a611f8e9bfe1d9a7a39f33b8d3a973d97fff98aed7ce0bb83f1acc1029b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm patterns, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://krisoc.ru/uplcv?utm_term=xtralis+icam+ils+manual PDF link annotation
    • http://ph2020.org/ckfinder/userfiles/files/42687842911.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/16792854705.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4e3e972f4---22203053965.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778f9061427---12300569223.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/fubazebezefam.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/12242904386.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/pepadaxabugovapuse.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/42517360923.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f10b3a857c---rupanedugajijekiruwofag.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/d13a8be56997fdf2ad573a302455fed3/71372760239.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/39262473400.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/ae32a8f4267904435f35db4a9752e125/xodirugikaxifel.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82854964370.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/38298719722.pdfIn PDF document text
    • http://apvn.info/userfiles/file/burugogebusipolivew.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abfbbddaff6---gizesebekof.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/a7644a23686843604205fece8493a407/63799000912.pdfIn PDF document text
    • http://ecole.ru/text/images/file/84891695220.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/ratofejiwijilipave.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/57910196221.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/88974054408.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2b35d50e---18065393070.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/dvg1mro9o7f3bnn0grfk7qhq45/97541419278.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/rotesojizit.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/tiragope.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6b50f3256---vewevixulegamokone.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/vexuvagogepozigikudum.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_off0000c5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CB 20140 bytes
SHA-256: 7970c051f50c94d85fb70790175945136edaaa0bd7dc1edde38db888e1778987
font_01_sfnt_off0000fa4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4C 10244 bytes
SHA-256: 1d7a90621a68dc2ff87bcbc44dd6162f133be7ef3ea7b07b46c98180a387b021
font_02_sfnt_off00011140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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