Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff6cf125e418e08…

MALICIOUS

PDF

86.6 KB Created: 2021-09-08 01:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f8ded9e4eb386ea7af657a6f84704ca SHA-1: 7636e35ed7dea2e6eb5e1c5d8d79559973a35efd SHA-256: 0ff6cf125e418e08a6820b1cc3e95aa7a2ac177c0144a46e96f017383725ee41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains numerous links to external websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting the document is designed to funnel users to malicious content through a network of deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=mi+ayuno+intermitente+pdf PDF link annotation
    • http://gianphoiduyloimodel.com/Images_upload/files/kaperizowubebokexuj.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/vfckdb5ev2bgljac4oc60m52v4/masizivita.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/52814279822.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091fff15e9ef---foloxunejewiro.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/tufuwisu.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/a9vf65givi42khus3d7ribq583/39906895395.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7d4b29e6664f6345ed268c54a4bdbe79/21087215260.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/mikimikamizozu.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e77726e381---jiliguwoxawavosabirisob.pdfIn PDF document text
    • http://stillwaterponies83.com/clients/74660/File/nowozegixul.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/15240203295.pdfIn PDF document text
    • https://www.shinoda-usa.com/ckfinder/userfiles/files/xudodigawemakajudolob.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b6fc614cb6---fagipunodokijabonikapejug.pdfIn PDF document text
    • http://oris-am.com/editor_up/32534038330.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/43195661952.pdfIn PDF document text
    • http://netflor.pl/upload/File/xubewetisera.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/pelafitarizaxodo.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/39726884597.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8d3012a1a---3644191288.pdfIn PDF document text
    • https://renetravel.ro/images/files/limameroputubanotuk.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/zowupiwen.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/90695494263.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/f7sq03t52q7gnkfktuifkcno84/67964456063.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_off0000ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001043b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043B 10652 bytes
SHA-256: a6110ac5a33637229f83c4415cbd9ecd7944b21dd94e47107501dba9c689de0c
font_02_sfnt_off00011c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9F 18756 bytes
SHA-256: cfc25d4be647ed7cdaa78e3510934d5ea4340ebc02abc6f25493d2d76abf180f

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