Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9bb41700af6f4d0…

MALICIOUS

PDF

70.8 KB Created: 2021-09-05 22:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4efcf66abc2a47bbf5e5ff5fc6d8963e SHA-1: af9f478d5cd245c49796fe151ad6335c24de31c0 SHA-256: b9bb41700af6f4d0258ee8018324c256bc2dd78572e3f175a820e9f7d30fef00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to compromised websites and disposable hosting, likely to redirect users to malicious content. The presence of 'utm_term' parameters suggests an attempt to track user engagement with these phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://nomylo.ru/uplcv?utm_term=higher+education+system+pdf PDF link annotation
    • https://ozmutludokum.com/userfiles/file/69872095134.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/gojulawozodipipojidipafok.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765f8387a4a---29878243210.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/suwuzujefokaloxakuleka.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/44563752688.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce3ee05d6f---xuzafixuro.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/e506741f35c168caa14d22611c8bd4dc/16278928203.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/lclv5fu3l0ibk91kk1abnqov91/11970217811.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b2641c4f7---86501468843.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e439731603---zasiluxevifebonaba.pdfIn PDF document text
    • https://bataretak.com/img/files/file/devefizejadiwidalimes.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/jurobujogurexipeger.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2a456d747---29496589486.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/cc81a800fddcd2e16de0158aeb61caf6/52915903712.pdfIn PDF document text
    • http://chayka-svg.ru/files/35152810958.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8c260aff1---guxosiwifadewigibopet.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/sereziw.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/xowinawovigofoga.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/58299086196.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/36b3819a2572251b3fb5d1aee2cc40b9/xoketejusidiva.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210722_9779F38F959031F8.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ap3rgpo27bf5un30l848f5rfq0/totavo.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f2faed4b3b51b841276f75d9d0311a11/zumowowikekuvurakesel.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_off0000b60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60F 11228 bytes
SHA-256: e9a372869ff9c17134dd851e650fd535424a9e88e0ce2503ac6c366015e268c6
font_01_sfnt_off0000cffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80C 14960 bytes
SHA-256: ce109d88d2520135fbacc6eb88aaeef4c84d4cabda1d79fa79924d64817581db

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