Malicious PDF — malware analysis report

Static analysis result for SHA-256 a975b918b9185846…

MALICIOUS

PDF

83.4 KB Created: 2021-09-24 01:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6a2a8838a90cdfb08a890ad617e7654c SHA-1: 9f10cde2d201303cfaaf45d69e2322d3d5b86365 SHA-256: a975b918b9185846c6165dfe2ce85865a2bf19d2addef4a93c5c92f9ba37e184
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further malicious actions, such as exploiting browser vulnerabilities or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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 https://infrive.ru/uplcv?utm_term=force+awakens+cheat+codes PDF link annotation
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/90595640240.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/79266122186.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/74357036182.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/38636403802.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/jixegaxibatexigit.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146e3a5929ec---74075853763.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/lewukotuziwejisuvesot.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/83216301746.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/tujowizatilosa.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/letuwoxajoxawonidajepoj.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/25419805265.pdfIn PDF document text
    • https://kede.org/userfiles/file/fogamizu.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/vitijubefalejimu.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cfe7c43fbd---wevebekefumubawulukupabo.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/vonivupewufuxitowonij.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210901_8EDC92F3FF1C68B7.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/nifebijusuvesodefopidaw.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/25473375136.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133f3e834f56---67916964201.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/budupezapegewaxovude.pdfIn PDF document text
    • https://biocoils.com/img/file/sawevobaje.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/98268565476.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/sigajifuloveketafadul.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_off0000e038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE038 10484 bytes
SHA-256: 938a42e95395a4c401ef1ea881132935ce6a772777abe0d6675ccc348925d39f
font_01_sfnt_off0000f80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80E 18944 bytes
SHA-256: 0497ccfaba16e49240ba683ee05d036a3f6cd9f570aa09b3cc6df6ba0132238d
font_02_sfnt_off00012818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1