Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4a52d45743a5b2…

MALICIOUS

PDF

70.2 KB Created: 2021-09-08 05:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cfb5ad487ddbe5f98d1dde0ea1f533d8 SHA-1: 8329087daa285a9c3a0d6ba1fa4c99dcb798f704 SHA-256: 2d4a52d45743a5b2f871b5a72e935d9b48b4d9db022b3ef2b5a30d51204913aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://catamma.ru/uplcv?utm_term=betrayal+of+the+promise+pdf PDF link annotation
    • http://stellamaris.cz/userfiles/74870746265.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/19621224345.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/99541312237.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/udabco1imfmdt15bs81kdn8uov/taninerixirijaxitokol.pdfIn PDF document text
    • http://berbun.com/user_img/file/zebojomirilavavob.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/3abf27db8e56b7bcb133af20ee125d94/kuxigejadewazisedutulidi.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/06df237dfd5ba7556dcba7165ca97cd6/68618777072.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e77c5fdfa---86320226600.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/94553267005.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/58048382503.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c968c8915fd---64453736811.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/51972151038.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/34144023827.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/o6t2l5r9rgcarh5ge1ke018qqh/17691138477.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hkj8v0n2u3d6c9ct75f9m3d321/fedamepivaxilu.pdfIn PDF document text
    • http://dringraldi.com/clients/7/73/73ccc230e5ee2b020474e4a43bcd07af/File/18711879700.pdfIn PDF document text
    • http://synodradomski.pl/userfiles/file/84837780552.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16082f8e588ca5---zubiribinofe.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/jatarekudutafaxev.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210620221153.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083df0c3e2eb---jizuvomug.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/6mguu9pmudsgvtbg0khmvq5fc8/20561871048.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_off0000b2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFB 10824 bytes
SHA-256: ec3a81d2156383ffcc4c2d11979215ad4a7cdd2608603d17e7c9223412dcbc0a
font_02_sfnt_off0000e3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FB 15768 bytes
SHA-256: 4820444b69bf4d16d03b36c53202279127229937907ce4436f0d33e09d9f44d5

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