Malicious PDF — malware analysis report

Static analysis result for SHA-256 5264e43333e9b4ac…

MALICIOUS

PDF

81.0 KB Created: 2021-06-25 22:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6e1f2585fa1ff886003869ec945375d3 SHA-1: 70dc0ee2ae5ca6b616721669a46e0f63fd9bad07 SHA-256: 5264e43333e9b4ac7dfc9927504907e6005944626305be50800f7a81561a735d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external websites, several of which are hosted on compromised CMS upload directories. The presence of multiple external URIs and compromised CMS links suggests an attempt to lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://crysiq.ru/uplcv?utm_term=definition+of+relative+frequency PDF link annotation
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/94b6b81244972cac72d1769998865013/pemobaz.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082762de238c---9814089211.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/bukuzurafojagaravilevuwis.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/gedobisefoxajesubozimaben.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/29993344586.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/numupejoxogaxivuzureto.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/71791712311.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/85428649557.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084bca9c295f---47193424290.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021060915055473499.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/4cf577d914b109f68f76d14f7e9430b4/80209900511.pdfIn PDF document text
    • http://446888.top/userfiles/file/37141932737.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e3273f548---51599021022.pdfIn PDF document text
    • http://skupka23.ru/upload/m/lugewetukotamazap.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ea5c5dd0f---kasawelufanofus.pdfIn PDF document text
    • http://jucal.es/images/file/werosifoxonanokulivimu.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e4107d0e1---zovumadipufev.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/suzuwusa.pdfIn PDF document text
    • http://abpaluso.com/upload/file/366479843.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/bcm88v9d8pkp7la2psuiud2ij6/govinekojalibinubenewiva.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac408d12a0---66650419958.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_off0000d60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60F 18360 bytes
SHA-256: 23307b05114b6e64a06665baa389cb90f444267f1d4842b4a06435460c929f48
font_01_sfnt_off0001061f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061F 10588 bytes
SHA-256: 2c18cabe156ce08a297dc45bf85c3efbbe4eb082e252dd383912051195ebc832
font_02_sfnt_off00011e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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