Malicious PDF — malware analysis report

Static analysis result for SHA-256 607680250ad516cf…

MALICIOUS

PDF

76.9 KB Created: 2021-09-06 03:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 750d075930365c7f2f28b32200e159c7 SHA-1: 6a53968d11458bf0a07bd9172063503441f7e92a SHA-256: 607680250ad516cfca5e1603fb98cb265c9e88a398139fb26bbef3afedc4db3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm its malicious nature. The presence of embedded URLs suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://infrive.ru/uplcv?utm_term=science+journal+pdf+download PDF link annotation
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7f71bb2d47---91776035944.pdfIn PDF document text
    • https://gangnampools.com/contents//files/faravorobar.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/a518a5fe5fc0322e6a3894b8d2a8e9df/lutazikazitojaxarikebibax.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/ea9ae3eea0dc376309bc82ceebc25644/85370734659.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/zobar.pdfIn PDF document text
    • https://amblamy.ee/upload/file/30528000085.pdfIn PDF document text
    • http://vodnik48.ru/content/file/vexogimelapuposofejamevib.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/mofigizopil.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/97591750331.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-30/20210530112137932786.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/d11ff2d09bfca87905570ceb8856c54d/42359382041.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/26731142814.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8653fc55cd---11344945954.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/31911996426.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/gonudojoxojasijevedev.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8a6ec196be---bodifitumosewowuwego.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/muvusobewakibofo.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/17196044552.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/xitapobapulujudiraxafun.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091989e9e952---26272578924.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/85327068386.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20219133839913.pdfIn PDF document text
    • https://rotitelor.com/contents//files/bixijokaxotuwogepozefa.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_off0000c5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC5 18492 bytes
SHA-256: 42453e64ec5accd6934269c3a3dd7026f2464c1736b592cce6837057b27176af
font_02_sfnt_off00010d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8F 10736 bytes
SHA-256: 89f7e47aabb9ff081ce2e2f23a0743a5eda483384d9c58942ce6efc190d8a73d

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