Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8abceb0d076f3f6…

MALICIOUS

PDF

76.4 KB Created: 2021-09-22 19:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 167703c1307163390c5a014505012234 SHA-1: bac99dac3f2571c4fe9f07110deee7706a20727f SHA-256: f8abceb0d076f3f67236eac0b253e67a1e690d906c542d8d314ae7c4eefe697f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, a common tactic for phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a method to evade static analysis. The embedded JavaScript stream and ML classifier further support its malicious nature, with ClamAV identifying it as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://carsonpokebar.com/uploads/files/seloxajakelijadada.pdf In PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/pojuredolovopudina.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/fotuwukovev.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a553b6218---sokifugitonoboku.pdfIn PDF document text
    • http://juha.be/_files/file/44872003257.pdfIn PDF document text
    • https://rippa.pt/files/file/jipepezekekuzolarumituwum.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/samilobagatodalotose.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/82273313285.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/kepepageximin.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/rnno61ismnf8iatnn17qb7krch/xokoxevanudinitalorowojer.pdfIn PDF document text
    • http://fgosvo.ru/files/files/xajasugabirokazerenotas.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/78930372890.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/vafenisumefitos.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b125ec43fa---43530433705.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/99092374697.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/faleduxutagejoliboni.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/rofepudituwufofu.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/67569577621.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d606fcdcb3833e8c3b17a667450110cf/jiboxebasidudexugezam.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/23835863156.pdfIn PDF document text
    • http://yepuco.com/uploads/files/65741402375.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/tojavulorewedixejida.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/fefuzavozadexoxetiropotis.pdfIn PDF document text
    • http://szigetkozpalinka.hu/userfiles/file/bilex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=file+zipper+apkPDF 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_off0000c3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F5 19388 bytes
SHA-256: 8890b838ef39e48d74c324ab3fff9cfeee87ca7fc67a18af82d32068e73652f1
font_01_sfnt_off0000f63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63F 9884 bytes
SHA-256: 327624db196d8e98ffedd0d816c4f2d55d0601f58fa2e14c764cd964c8aa038f
font_02_sfnt_off00010c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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