Malicious PDF — malware analysis report

Static analysis result for SHA-256 f132670a1b1a9cd5…

MALICIOUS

PDF

113.0 KB Created: 2021-06-24 01:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c1d68f024519bcdf8feb5f3aafa8cf3b SHA-1: fd7c15a29eddf49bcf5b4655e3f06cac77635698 SHA-256: f132670a1b1a9cd58924dbba5a03d3ac37830108c169f5299b2af043baf8bea5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to direct users to potentially harmful content. No scripts were extracted, but the primary attack pattern involves redirecting users through a network of compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://chcial.ru/uplcv?utm_term=roman+god+of+water PDF link annotation
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609618aa79730---62066826729.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d36ec1d8150---bezozoxukunilapabov.pdfIn PDF document text
    • http://expresskaliski.info/file/62533376565.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b41cbeca133a26abb8e78aad7a5ca457/69599196782.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/eb328032dc66bfab9132ea82e3fa0496/jajupatewezow.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c56ba1d28---50711271186.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c03c030a6---pekezarapabidanejara.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/17717530833.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/pitegupavexiduguji.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/5449773729.pdfIn PDF document text
    • http://garderoba.sk/images/_file/37585450359.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/98919239584.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/9bd7ea10514af079b8240cf8ac7a3769/41452304588.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d0b378fd1---kefutiboposokipad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13186 23308 bytes
SHA-256: f7e3c7048836945e6241236143439f363d66d4c5fe089ca04e5cc86e395e12de
font_01_sfnt_off00017a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A8F 5116 bytes
SHA-256: 5e9eed38576f6ac60ce26041cfc1b9a0f812104ec0e64a8673d42c9d79471760
font_02_sfnt_off00018bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BF8 14232 bytes
SHA-256: 1121c27f5bd28a3033a1e0ff1590d94c57f28589c665e9f6040ab282f564d5bb

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