Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c1ba691d29f2db…

MALICIOUS

PDF

89.4 KB Created: 2021-09-08 06:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f7c77413eb93da5ffb01dbed13c111b8 SHA-1: 6d5fa46cd8654505214219200e1dd7e1b2f262bf SHA-256: 19c1ba691d29f2db484db0ae9aa0367b1835732bf19c8bde1183ecf7cd0076cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution attempt. The document contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards an attempt to trick users into visiting external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://allytemp.ru/uplcv?utm_term=six+sigma+case+studies+with+minitab+pdf PDF link annotation
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/j9jdn37gj0buem09600k60idf6/35919313289.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/8679274184.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738350c6349---37498577746.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea004a26f2---zametezilil.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d79347484d8---mixigo.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/lugirarevav.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/73477803836.pdfIn PDF document text
    • http://soechi.id/userfiles/file/10729096808.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/370544131.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/8660088521.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160fb12aa21e97---wudaruwuzefokokifogebefu.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202108280527432357.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/4c60c1999fb0c8b13b7d51c579d5aabf/4039330874.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/87de2eec7373553aa0aaba7c57738b94/nexasujodelunopigeb.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/r9mbtlqi0snfl42v68vq994ss7/jemogujewor.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/30298184.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/19593589031.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/94344055343.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/gomizakurejajutuwitif.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/65349789764.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/12968811007.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608663eab78f0---80120060712.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/kinefojuvefowakakepajur.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/mililagidefimu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFE 16892 bytes
SHA-256: d0d0652c43af3578540cd433d4bebbc8a5e893acb27f6e4d000bc6ce28489a3b
font_01_sfnt_off00010709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10709 18108 bytes
SHA-256: 977be2daca865e1890da06fb8d2c8a748e8ca8ef45cf49f60ee0b3a3c5d9f94e
font_02_sfnt_off00012342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12342 11304 bytes
SHA-256: a4e0b1e1d5d2c74f365ac72165abe7c93d1bf0412779fdd46048202c387d1d7d
font_03_sfnt_off00013d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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