Malicious PDF — malware analysis report

Static analysis result for SHA-256 c60aa3ff383d04bb…

MALICIOUS

PDF

85.7 KB Created: 2021-09-03 21:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6104ae43bcd122153f794eb94c1038cf SHA-1: 7b17199642b5cdbc2b82d665d00682b9daff9f65 SHA-256: c60aa3ff383d04bbc473c92ed798832f821c68b8324b00f27d6d6959df36e3dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting domains. The embedded document body is heavily obfuscated and appears to be non-readable content, suggesting the primary purpose is to host these malicious links rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crewmak.ru/uplcv?utm_term=socialismo+ut%C3%B3pico+e+cient%C3%ADfico+pdf PDF link annotation
    • http://ourdesign.hk/ckfinder/userfiles/files/wuvokatowekefepu.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210617203029_afbpdf.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/lefobuv.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/78833290175.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/71273286797.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125b40cdfcbd---5737138818.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/53558878139.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/57404672886.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/6r1e3mg0b56ju7nn7q6scogt4r/5973698142.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/c156238014444084fafe8e1f3256d4ae/21438144000.pdfIn PDF document text
    • http://casaalu.com/luutru/files/tefog.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/51569149459.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/fuvar.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/67748701159.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/e1ghug60k7sfpqk3poh9mjdmi5/72651144702.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles//files/gejanujepitopipupojavu.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/2u5alqcqrahgfe8gvc27all965/sipabaluw.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ebfea77eb---lijawijabugevuxokepeluko.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/mosavubo.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/4637542855.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96854583869.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611ec6b605778---kipesivamutivijakazafurur.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_off0000e2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 20052 bytes
SHA-256: e41c281871e8f1b385b39c1f1c2405f521bb3893a25923ea50a9cbc52e94582e
font_01_sfnt_off0001155f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D76 11056 bytes
SHA-256: e62ad4c3d8ccdcdc6767bdc56fef97f1f57f11df33cd57cf032af185c50c20e5

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