Malicious PDF — malware analysis report

Static analysis result for SHA-256 434fe35c2284916e…

MALICIOUS

PDF

77.9 KB Created: 2021-09-18 23:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 78ade0d5eaf5ea8f1616d093aab4f9c7 SHA-1: b4acb1a7274add07a37667f1f80645f2e0d450df SHA-256: 434fe35c2284916eb23888ab998fe5f3176a73823248a3766768b8bbad14a741
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and the overall structure suggest an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=fine+lock+pro+apk PDF link annotation
    • http://solyaris.pro/admin/ckfinder/userfiles/files/3658892130.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1b85e3e38---lijevarafoxagimimokadat.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/91774869019.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/76621796242.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/rawekokuw.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/judonurime.pdfIn PDF document text
    • http://superazs.ru/images/news/file/29664282663.pdfIn PDF document text
    • https://lederstuhl-shop.de/ckfinder/userfiles/files/60578651877.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/48960589176.pdfIn PDF document text
    • http://venus-forever.com/image/files/wimim.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd9e1ae3bc---variroj.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/rediwilazibofujeneta.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/natubaxabodanu.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/80290457381.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/rivakujesodirurezetil.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/70865774987.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/59346317102.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161368f2bb729f---rudaxetigerupotalutub.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/xejemozudob.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/mugivuvikuwele.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/26106499933.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109180625342571.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-13/20210913135426931486.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_off0000cf8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8A 17080 bytes
SHA-256: 8337188edb2f70918d3827e15bf8f34c61d318f472bf4556c04d0e3491eb8e82
font_01_sfnt_off0000fb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001137d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137D 10168 bytes
SHA-256: eaae2cfac05227e5aa2440c2968bb48c84077ff2991a8d0598c057d165a5ee07