Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ebbfde7e3c86f9…

MALICIOUS

PDF

82.6 KB Created: 2021-09-09 06:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2d34212b025c63cab41bbfaeaa26fb2a SHA-1: 9c03c510bcdaa293be762096ba9335fcf0ddbbf4 SHA-256: 85ebbfde7e3c86f9483743ebb30ec81587184582cf9cc8a6ab9f2bf74240706c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a phishing lure or download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://gok-maciejowice.pl/js/ckfinder/userfiles/files/42663103573.pdf In PDF document text
    • http://ecoaga.com/documentos/file/84185749712.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/66158292671.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ind4ve5bev7fhlef4okc2pi4ru/fadifakavorelemabokegive.pdfIn PDF document text
    • https://seerupit.dk/assens/file/73537380824.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311d9c2a45b---sezoponomogiluzefomominup.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/37033896256.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/77854622909.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/lexurumozemug.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161318db8c16b0---14602361638.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/73391714749.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/dariwipaturo.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/66279195930.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/90334381580.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/84038139243.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/46691227799.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/turedibowivefixipasofu.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210905232139.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/jejirajaxazek.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/15505327979.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/42457510561.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/33241151904.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/gobeduxevomixatu.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/5252804993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=watch+the+bachelor+online+free+123moviesPDF 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_off0000dcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF504 17584 bytes
SHA-256: 3ebd61822eae6148df24ae3f672fabdccf848cebd4cf4a67a030b037f569ab9f
font_02_sfnt_off00012293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12293 11144 bytes
SHA-256: d4bbc7097b599304229e638a69dc48d3dfcd92168a325be3a9cb016409b340aa

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