Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac9e40a5099474a…

MALICIOUS

PDF

89.8 KB Created: 2021-09-08 19:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2654fe0c3eb46247d5fb9d7157184a9 SHA-1: d9519977191732b10cd29c9d3f110b7fb6704758 SHA-256: 2ac9e40a5099474a208a09bdcef5a9218a1759f7a11421a391cac2b7a3de7999
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to direct users to download further malicious content. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://pixomot.ru/uplcv?utm_term=%D8%AA%D8%AD%D9%85%D9%8A%D9%84+%D9%83%D8%AA%D8%A7%D8%A8+%D8%A7%D9%84%D8%B1%D8%AD%D9%8A%D9%82+%D8%A7%D9%84%D9%85%D8%AE%D8%AA%D9%88%D9%85+pdf+%D9%83%D8%A7%D9%85%D9%84
    • http://abwcolley.com/uploads/files/1230513889.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349ae5358dd---72874646385.pdf
    • http://urjabatteries.in/userfiles/file/bemazezoxam.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c670ea310---57292257581.pdf
    • http://hoanhaochemical.com/uploads/files/xefupatunagewopafovigiref.pdf
    • http://manavpublicschool.org/manav/userfiles/file/98281371969.pdf
    • https://yodobashi-church.com/delividuwugazobularija.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161355e9fd8fee---59965830549.pdf
    • http://thamcohoaian.com/webroot/img/files/xokesijuzovonuzav.pdf
    • https://tomas-music.com/contents/files/87705552119.pdf
    • https://interconformity.ro/images/file/62547669668.pdf
    • http://benthanhsgfarm.net/images/uploads/files/zebetiwe.pdf
    • http://studioguatta.it/userfiles/files/40711903378.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/29cee8c606ac4e1d96e3991dbfb783c8/758041068.pdf
    • http://savvyais.com/userfiles/file/gagajobobuliwalegubel.pdf
    • http://mediedil.eu/userfiles/files/zimupibuz.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cf71b04c0---nurerukesepumo.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161368261222a6---gagesuk.pdf
    • https://tkquiz.com/userfiles/file/21341256050.pdf
    • http://labsshop.com/d/files/79197533513.pdf
    • http://ud2-140.com/files/14037580560.pdf
    • https://nileagriculturalindustries.com/file/98048914914.pdf
    • http://fatename.com/uploads/files/202109030306165453.pdf
    • https://ilexgold.com/app/webroot/files/userfiles/files/13475693927.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001175b.bin
f7504f1dce7b82b4a06c13a83f93af1382a36e75f398900f0c46f2a4c6edfe2a
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1175B 24132 bytes
font_00_sfnt_off0000caa6.bin
cecf5e841fad66f8b92a44bc52f0982cf0829f7b551d52d943e37810f4510031
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA6 18012 bytes
font_01_sfnt_off0000f8e5.bin
f758cb71b4f96f1b0a2210cb1cbcd2ffadddcfd7b4e2cbe126b63c153e6c2aaa
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 18952 bytes
font_03_sfnt_off000141f4.bin
ab692011bb810b4091e5b6863c1468cc19624005727076e0e42723678ec61724
pdf-font-stream PDF embedded font (sfnt) at offset 0x141F4 9372 bytes