Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8ced7b1f572b72…

MALICIOUS

PDF

92.9 KB Created: 2021-07-03 06:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e56d8e5101381d4f7325ecfbd7f59db2 SHA-1: 22df6024eab6a30203ccaeea1adf47290e420b98 SHA-256: 2f8ced7b1f572b7257f65928855c403f3b35115c2efd6c5ed1ca47cc370c8726
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and link farm patterns, indicating it is designed to redirect users to potentially malicious or compromised websites. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to create a link farm for SEO manipulation or to distribute phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://crewmak.ru/uplcv?utm_term=nissan+march+k12+manual PDF link annotation
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160777c6833a7d---nabewulaw.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/79eff258d7fbed87150b31a4d7b44a80/58335661963.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d1078c206---xidebezodanebo.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e887e048b2---3731146680.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/5ee0bg2d688c1m6bh3vniat7h2/faduzatilanaje.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/31103537584.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/38655978651.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/23696328346.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/12933925795.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/mopizumowemotured.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/dewot.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c5c9c9794---nugigad.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081d848f0cbd---mazogawiteritiviliber.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a84d9acb36---66079291368.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/96689257358.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d14a54f72---89546796460.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/55062123257.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/eb1ae83c88200aa29a22ba306d4c6c51/14089715591.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/eadc8l9b8v6q73q043culaceg4/bawisufaw.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160829a937d07b---relifewafilejosam.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_off000106c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C3 19236 bytes
SHA-256: b3e4287681d9a412cfcc5e4926b15bddea987d0a381fc81d0daa940a5329e114
font_01_sfnt_off00013721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F38 10488 bytes
SHA-256: 28e1350cc491cce1970ff13573c13893f748eeb723133752ef9403eceda5bdeb

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