Malicious PDF — malware analysis report

Static analysis result for SHA-256 34dc79fa39a2286a…

MALICIOUS

PDF

90.9 KB Created: 2021-09-03 12:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a436cd3dbbb0ba8a420136bec44878e3 SHA-1: cb0e1b9a260ae2a8f412dd5954c3953852d9c5f6 SHA-256: 34dc79fa39a2286aebc2f4d6e51f8359ab79141cbad576be00cddd3de86a6a82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://queure.ru/uplcv?utm_term=critical+and+creative+thinking+skills+pdf PDF link annotation
    • http://bsbcarpet.com/userfiles/file/bovidogixedawose.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b880f36f430---susuvoxexideridawi.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16081183b937c1---55974909445.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ceca842b7fe---34525365761.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/xunoxiviwebebi.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/meram.pdfIn PDF document text
    • http://centronegozi.com/public/42680755213.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/7002094674.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/608058d7cb2dc148d1d064559fe53a9a/viboluvafomapakuf.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/8055f2438ba998a19bc54311e373cf7d/58696026423.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/vodebozaxes.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210817043015.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/semirumazokuxomata.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161141f123e9de---jejotepuzalibobukufu.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/25747170571.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6e210815---lowitoxazej.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/ce1e201d65a7d89390b843a44a3af1b8/12044413302.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/56573228532.pdfIn PDF document text
    • http://fullx.net/files/70639107994.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/93026a476e014288e5ca87ca3018ed88/26356790553.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/monakunikabisubevafusax.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f25979680c---99837110439.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_off0000fe28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE28 10968 bytes
SHA-256: fe13d863f8a2376137876f458965bb375f8eea4d414f801cc5ace04eed9e79b5
font_01_sfnt_off00011763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11763 17964 bytes
SHA-256: 4d7ee9d02391d1786dfd5a2699478015511695d19443a546c63b461f910dc297
font_02_sfnt_off000145c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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