Malicious PDF — malware analysis report

Static analysis result for SHA-256 968cb9f006abdc6e…

MALICIOUS

PDF

77.6 KB Created: 2021-09-09 17:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e96eae85d9c972a6551d2baad47419f3 SHA-1: 0d8f1279ffa3cdaaf5e936a38da1143c09367f57 SHA-256: 968cb9f006abdc6e4f33c30d6f53636d1b72b6fe77116a8c38ca1056f677b5d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple links pointing to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS uploads indicates an attempt to distribute malware or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=messenger+new+update+2020+apk PDF link annotation
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/24f689e50ec8d6608bf8bc2721f20e87/96595470065.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/lazilemedakanu.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/54766797471.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/dapusadoleg.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613627a3a43c3---janaporoxuxejugur.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/2377115964.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/20608186032.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/fenomiwekakibedejoxapubum.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/97377533111.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137c1eb3afac---3199081873.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/jakovevivo.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/rozasozajuxevaxatomevoro.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/99786937253.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/931fbc458db8bdf78019a0e2adeaa8d0/zirenekuputi.pdfIn PDF document text
    • http://kco.su/userfiles/file/80115231687.pdfIn PDF document text
    • http://rilta.net/userfiles/files/futonoxonifov.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210909164934.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/30322777452.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/68774325806.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/rimib.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/xolij.pdfIn PDF document text
    • https://negaratoto.com/contents/files/totejewovig.pdfIn PDF document text
    • https://preciseenergygroup.com/media/lomotewukot.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/23457405824.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_off0000c813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC813 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02A 10820 bytes
SHA-256: 34a2d00746d5724e5cb8cc80042150cec0e5b1003f84d246554def186a127d10
font_02_sfnt_off0000f934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 18448 bytes
SHA-256: 9bdf1e09895184e82285a2a8a998113c5494e611fb7b2860c577224b4f4ab859

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