Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67c3da6d5f14b27…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 01:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e42c1ade388c7dc4e6d5365b0d23cede SHA-1: 23ac4571b9ef2709e4a9df55e25303ceedb25316 SHA-256: b67c3da6d5f14b27e331a7710907f59ab697897f0f3c975c0d25f9dec9c8498b
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The file's structure and heuristic firings suggest it is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410fb2a5ddf---55230166885.pdf In PDF document text
    • https://designclarf.it/file/nudamukereniwimudale.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/25414227389.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/3051269239.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/63905864982.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/32345110833.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210907033305.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c070eec464---nevowojiwijejizuk.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/65526424247.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/bupativokabukusoxofus.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/zekusobedemeg.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/movorijedifuramagexotule.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/99066741086.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/vifotufaro.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/dept54sfagq9asotiv6tgncc73/35887975909.pdfIn PDF document text
    • http://446888.top/userfiles/file/98753119025.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/guligipovugiwuwoxe.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/nixufamonotikekafadegojoj.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/27943655298.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/dulogebimagefivinomafuf.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/lopagodinunejowomidej.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/49767356000.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/fumime.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/gizozab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+slow+regard+of+silent+things+pdfPDF 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_off0000d290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD290 10828 bytes
SHA-256: dcdcd79fd44263a28c98a182b7fc4b68a048d0f16e457c695b11d1b8ba8c4e05
font_01_sfnt_off0000eb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 17824 bytes
SHA-256: 4f3a9cf3030584474c433b9c8cb2d49399097f027f30eef387c1e4c0026ab549
font_02_sfnt_off0001199b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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