Malicious PDF — malware analysis report

Static analysis result for SHA-256 6496773595e73c87…

MALICIOUS

PDF

75.4 KB Created: 2021-09-09 11:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 385e33596ac4862ec4e58c7b594085b2 SHA-1: 9ce9cc6bc4d225155ab0953f1c4c3e66ef097362 SHA-256: 6496773595e73c87c2a613783028271bb3d0c3ff780ecb85fb79b161c9975a19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF that contains a link farm, directing users to multiple external URLs. Several of these URLs point to compromised CMS upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0aa04193b---95956132463.pdf In PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/tufapumugole.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/13036949665.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/tipigoworuwapovuvenitekim.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613670614fce4---971595567.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/lawibitijezubuk.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/68674384628.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/67037790154.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/nizoxoduperutojub.pdfIn PDF document text
    • https://carlojans.com/cms/file/9363166189.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/57903247546.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/39468497738.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/86937986451.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/kiwaxegepafipide.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/32000012753.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/1130358986.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/78673652449.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130dd3a8ddf6---zitisuropidepoxena.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/vewelufojo.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/jalivaralirosovijaf.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210909162746.pdfIn PDF document text
    • http://ranfeng.com/userfiles/file/2021-9///2021981453377789.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/46396820135.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/76640999532.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/16337916197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=what+does+jailbroken+firestick+doPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/resara.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_off0000c17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD990 17376 bytes
SHA-256: ca767cab83ca08365e030a054cc664e73174959143b95375aa6304bd3cd6a8b5
font_02_sfnt_off000106d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D7 10928 bytes
SHA-256: 4b479c2d543f6aa713fa8de3ec4356d152b362f30b93b7e06c64b621a665c373