Malicious PDF — malware analysis report

Static analysis result for SHA-256 85eba3f9e86c7520…

MALICIOUS

PDF

91.3 KB Created: 2021-08-09 17:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f1d34f353740a8d3c1f09d3ab1c50405 SHA-1: 4f5ac1fe0689999608fac97efb46ae947dddea79 SHA-256: 85eba3f9e86c7520b459977de3b393afff73338291692e69b123032c3128eaf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to compromised WordPress sites and other disposable hosting, indicative of a link farm used for SEO poisoning or phishing. ClamAV detection and ML classification strongly suggest malicious intent. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://franchise-vietnam.com/app/webroot/img/files/vetugemokeg.pdf In PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/96eb2f579752d1946aa91d83569cc0f3/tedeluzevapikixeg.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/b8osl6ecmnvqipk5edkic30oh1/72694691006.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/kagutonuk.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/2a89b5306b2ad4fa78743a6dc225aae6/37197388153.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/dawozazetidibodagalix.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/49b7eb22d2a760bfe57b1e9afa21e324/siporutusugox.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/d5bc5182c15ee7348aa6868a54101bee/fekusomeji.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/57448122759.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/6977cd1dca7e777a62af387d6870b25b/15370126143.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d31f0f2532---bosenesakirakeruk.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/2535dbf1d4ed77c800d5b7fbf50d7b1e/jogopup.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/subedimabi.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/95873232014.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fca2bed481---vajig.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2u6ljca9auk1cgj4c41tdegm30/poboxegujeturajitapewuw.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160947dd65a9ee---83999025762.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/25461792368.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/rikamejofidezomodelug.pdfIn PDF document text
    • http://livilgirls.com/files/28660550399.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/99930522022.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/ponuwom.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/besikikatafegifemorinaze.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/56090362653.pdfIn PDF document text
    • https://agermag.ro/mm/file/32161389602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=internet+explorer+cache+path+windows+10PDF 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_off0000fdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EE 10924 bytes
SHA-256: 81747d5564775e53b222b63b589782bb3f90457ad4ad8075fb0780c0c38a84c6
font_02_sfnt_off00012f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3C 17860 bytes
SHA-256: b4da9cf9372cd5f98f430a4dcf4cffb7e1d0cab97d170be0ef2c912b77b2d982