Malicious PDF — malware analysis report

Static analysis result for SHA-256 6755e24734d159d8…

MALICIOUS

PDF

76.5 KB Created: 2021-10-13 09:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9762b3efa1818299c49df283515db52c SHA-1: cf1912149b8e7eceb06ad64485b924c227eb5092 SHA-256: 6755e24734d159d86edf43d7288f11a551b6ac6fd9fe5a773fc2635b47f38f03
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm pointing to compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. The embedded JavaScript is likely used to facilitate these redirects or further obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://clearspace-design.com/CKEdit/upload/files/mozagibupofa.pdf In PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/gaduvuli.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d326a760db---86525884624.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/garewajutaf.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/603947492.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/26944854552.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134230594b02---guwuwenodinomababob.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/vafodixal.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/sokezod.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/tovavinotemu.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/pexaxijirudenek.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/56118071311.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/42311540827.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/jutid.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/48320725934.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/molanux.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/78925877836.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/gadexumugume.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614903f52e24c---dozasexekij.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/nubibimuxus.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///lemuxesuvixulupejo.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/40480117027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/u-9XGpgKpwY/uplcv?utm_term=splices+and+connectors+in+optical+fiberPDF 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_off0000c48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA1 17812 bytes
SHA-256: 65f9ffd82aab287936c67d46a54f820ca01eeb2657f2cf40834b88d01289d62c
font_02_sfnt_off00010b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7A 10828 bytes
SHA-256: 18e468e64a10ff454f21cb2449b87c1062ccd1cdfa8692f10640244eb6a137b4