Malicious PDF — malware analysis report

Static analysis result for SHA-256 90eb6a6f32814c29…

MALICIOUS

PDF

80.7 KB Created: 2021-09-15 16:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d5c773eac601bfedae905b254a823bff SHA-1: bfa4faf1762e46b4a987902295e859cdb1ed9ae7 SHA-256: 90eb6a6f32814c29e20287270f079a5c0b07db5676eece6782021ed7ad6b1a56
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. This suggests the document is designed to lure users into clicking links that lead to malicious content, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613455ea7bff0---jevisufejizabazufil.pdf In PDF document text
    • https://cordovajewelry.com/images/file/4749598144.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/samikogoro.pdfIn PDF document text
    • https://kimansion.com/uploads/file/dexej.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/veselo.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/9160719276.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/xozoguvikug.pdfIn PDF document text
    • http://kahasat.cz/data/file/xenataroguzuza.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/d2bedec502f551e4d7938ebf2b7e8bbf/77072149194.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/70904728462.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/raxozobadenupitixerom.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/14493103996.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pogugawabudok.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/80298831491.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/57830346870.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/bujowimolatopidoz.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/96221717050.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/62668aab87f7e3b60e3eea13293e72be/71967434350.pdfIn PDF document text
    • http://osayit.com/images/file/majurulizalolupegexalobiv.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/96903757287.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/66200642818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=math+ia+examples+statisticsPDF 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_off0000d4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EF 10412 bytes
SHA-256: 8d6e4af81ea84344b4f98d9163d8492b5534092f5377f01271532168e3bf9530
font_01_sfnt_off0000ec8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 18852 bytes
SHA-256: cd08c9be5f16a39ec0d71122c591a80e2e1c46a808d7898e419a30a0f4abd81d
font_02_sfnt_off00011d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1