Malicious PDF — malware analysis report

Static analysis result for SHA-256 1732b5c8260ba16a…

MALICIOUS

PDF

74.9 KB Created: 2021-09-07 01:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7b1b3291be145f32b669aea43bdefd27 SHA-1: ee2227ccd5810a344ba84b0d9a584e4a924e3ac3 SHA-256: 1732b5c8260ba16a20b509528e40785e9e906b904fab7e9227d82a77885c027f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating it functions as a link farm to distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, with the file being identified as a phishing trojan. While no scripts were explicitly extracted, the nature of the links and the detection indicate a likely attempt to lure users to download further malware.

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 http://inglewood1968.com/clients/68690/File/1494383337.pdf In PDF document text
    • http://ajtoablakcentrum.com/_user/file/29636448679.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/df3jk77sj8uqeuel6gk1g4al9h/75170728448.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ba008a3a---pigodegubawarepudetokuz.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e0da3c8e2---80890593419.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/72799616362.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/rujuwizivefosenonuzofu.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/8195279209.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993728ceba0---590066814.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb8c41413a---1668198631.pdfIn PDF document text
    • https://loyd.rs/images/file/petosakatafekuboruguse.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/52264054936.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/41419892343.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afce29e164a---wolitokivulemafuno.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb40a92ef3---80617487049.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb2d523d92f---31760911887.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/wujuparirunomiti.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/vegitejokujonulewovef.pdfIn PDF document text
    • https://wasael.com/userfiles/file/20253701476.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/10683075459.pdfIn PDF document text
    • https://pratham.one/file/41742177107.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbfdbd6830---36118258069.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/wobetoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=acyclic+compounds+pdfPDF link annotation
    • 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_off0000c12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC12D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD944 10484 bytes
SHA-256: 19d7aeeb0aeea246959df366d0932ca0ecc43c269f355420fd92f4dc285f3a70
font_02_sfnt_off0000f109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF109 17296 bytes
SHA-256: 42acf7d53115881b0ac6183045dcb54a89268839723fd922671dbcec7188802e

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