Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4920a90ce0df15…

MALICIOUS

PDF

93.6 KB Created: 2021-08-15 10:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 57f918746b0e261cd1bee8a1dee7be9d SHA-1: 2b92ea65015dc7598a92581aa301b6f6abeeed61 SHA-256: 5f4920a90ce0df1524b7c388bcb5dedd60ec0beb686c3235d1335b625d3d0676
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ecohouse-lab.com/userfiles/file/bojunafumiboja.pdf In PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/4bb904f32242ce64442e871f85d99454/kilubiwus.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d06265c9e---63778637818.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8e23d959a---ropadobezajazi.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/18487171810.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/83471005618.pdfIn PDF document text
    • http://www.toptehnik.si/images/67008058246.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/ravemoda.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/50275451813.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/22836202104.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160edb1a950e98---4471058156.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/41592835463.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e2625cdd2c4dbb7b9fcaf337962690df/zolamerow.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ec4730c4a---49813218426.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/f86ddb24b77a1e1cc1c30ce5531acfe2/82793313890.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/fujevuk.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/kanitem.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/lkofdas3u1lo07i51lggh16q75/diwujapuzukesizo.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e027353e4---87909851345.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/towaxabemuwe.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/narujew.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca93c6f7af---zujazodemefokaxararu.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/75175302000.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/53737410788.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/fejunexutakurukofik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=exercicios+resolvidos+termoquimica+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE7 11076 bytes
SHA-256: 55faa268e7d533a3b27905e0bfce3c46112b192e0edb5eb8e7f8b1dd262eeee9
font_01_sfnt_off00010892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10892 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
font_02_sfnt_off00011e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13640 19012 bytes
SHA-256: 3cf25a4e30e6c28483c72590cdebe09636c850520b98fe5a0e990468810f1f4b