Malicious PDF — malware analysis report

Static analysis result for SHA-256 7848c113dd048fa4…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 05:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 47ef6e953b2a980439c0ef7f8ebfc233 SHA-1: 2fe251dfc15c98957311d302d403203c3683df81 SHA-256: 7848c113dd048fa44bbd4c5589fca975a18bab3ac629f412045d9fdafa223339
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to external resources. Several of these URLs are hosted on compromised CMS upload directories, indicating a potential distribution or redirection mechanism for malicious content. The presence of multiple external links suggests an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://stowarzyszeniemalyksiaze.eu/img/upload/files/7706064991.pdf In PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/22348374099.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/bafiloxija.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458479e8f22---temufenufobodegotaxe.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/88930368009.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/91617475651.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109091402131827.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/tnuvacffue1n05jntg0bt4esa5/gosesezukoxupoduza.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/23390896537.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd96e67a56---97044611606.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613f28a0bdb53---43566846703.pdfIn PDF document text
    • http://gyliver.ru/files/files/39813958021.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/jepebifozenakeri.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/88e0fc89dda789865fe0697c4407dcbb/lokekuzajoxuko.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/sasip.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f843d57d03---zukowufewagotenofenuja.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/vimuzijerujitajifufi.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/796cfdd7b025c3eaa020302f003fc749/zoputubijewe.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/vofotonijoketiwetav.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/15680397739.pdfIn PDF document text
    • http://cwesp.biz/upload/file/80948305824.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/70318617466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=push+and+pull+tacticPDF 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_off0000da3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3C 10360 bytes
SHA-256: ed89c0c37b0d6505dc7543061f46568636a6abd464cec0f476086bfe2e7297d2
font_01_sfnt_off0000f188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF188 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001099a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099A 17384 bytes
SHA-256: 937112b0c26ce5efe0a9924d07876f6f34551cd8ccff69ba4bcf91a0b795eabd

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