Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d1ff7cb16ca6ba7…

MALICIOUS

PDF

106.8 KB Created: 2021-07-16 00:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fc1f674bb97d02448d94dc025821d296 SHA-1: f4f7c7db00c9e70ed066fabb87701ba9623bfa9e SHA-256: 6d1ff7cb16ca6ba7002afcdb70d4ed47f9d8f8ac88b4d16cf5a603f29b825fcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's used to redirect users to malicious sites. The presence of external URIs and a link farm structure strongly implies a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://laborke.ru/uplcv?utm_term=research+papers+on+human+resources+management+pdf PDF link annotation
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3bd844ca---nupojiv.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edc5c377a3e---11781689454.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/4bvjsd345r2s5r675j048670r5/nawupoxazola.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/tetememofoto.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb01d2f0dac---sokevozemumudelutip.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/t360qr463ngk9unuliopam3bsu/10769319479.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/zomovagebuvewawunaturu.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcbc75c053---pevosumudadalafo.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec5a80eced---putobemifiz.pdfIn PDF document text
    • https://agermag.ro/mm/file/gutokobutuloxejetosoxo.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/66577996066.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/847e563135b66c98e34cfbd322b6205b/72737721636.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba54c511ce6---vuperak.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc011d417de---dewiwuvozurulifimupakedet.pdfIn PDF document text
    • http://ahchala.com/img/file/kemuxirijunewagokenumo.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086192f4c1ee---72375951648.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/kemugorodavewuridemevubut.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/eplf45nuu70lp7scs8qo397ui4/towizoworawo.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/kuroxopenowafufekopabun.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abfdae0473a---79646340190.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/gukudamefesixezibedi.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c513fc68c69f65b12f0f8d6d4dea6897/48514107132.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021627547346866.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_off00013fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA0 11076 bytes
SHA-256: e65b2f8b83abca00efef67bc9e3bdbcf64b2d0e8ecb6716a96e13f74a1816c70
font_01_sfnt_off00015919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001712b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1712B 17216 bytes
SHA-256: 9e1672759bb93db055eb38f8b8eb9fb8a91a44c451a00f91c9b4fa75b759ceed

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