Malicious PDF — malware analysis report

Static analysis result for SHA-256 267bf5df235f7a9c…

MALICIOUS

PDF

81.1 KB Created: 2021-08-11 10:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e3f2d9cd626fc44ece1de28bd501985d SHA-1: 60fb1145a88d515962ae0e4159550d7eabfdeb27 SHA-256: 267bf5df235f7a9cc23fd2a4f25a87b3dcbb5c76c7f5131aeb012454c4548a40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites, and others to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of links for SEO manipulation or to host malicious files.

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 https://crysiq.ru/uplcv?utm_term=dominos+pizza+near+me+number PDF link annotation
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/628d54f89d3e5de3b9930260f743471e/1504606331.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f48fb9c3df---31104230899.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/16270549871f02f80b09bffba15751.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/venozitide.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/d90223b845743d156d72a36ca0cb5031/36334026583.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/lupak.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/8025539173.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/fq7k69le8ebra6gainj0a77kpv/lapoj.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/tbf5c5fd6vnm84hu6jluub2t2c/mudidoras.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/43507311825.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/xilapetalerutoja.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89661acc2a---butekuleruduredukewibezow.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/skfp4cguaa5unfuhcasaiphl18/22657336420.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/6pd3f39tq26mslslssb8p8amgv/navulimi.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7702b11cab---26191641024.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/posikatexagoxobam.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/ruxepi.pdfIn PDF document text
    • http://from.ua/upload/articles/2021/06/16/files/pazigajinogi.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/2039455577.pdfIn PDF document text
    • https://tjpapigroup3.com/contents//files/bijuja.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/55ace9381abc568e123be89135533d6e/vituvosovofomuronimel.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/223701434414e6cbb31092b559d30d36/19811753219.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088c2c442ded---32754679880.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_off0000d8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D7 16880 bytes
SHA-256: df0671490d1d63c8d66ec2c934f54b4ee435668085d6de4ffec3237aaed237fe
font_01_sfnt_off0001052d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052D 10568 bytes
SHA-256: 9e6c3bd9cc8f201149e2806a00f07646a0a6036d7106dfc5774af2daefa88dd7
font_02_sfnt_off00011d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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