Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba9f61aee166e196…

MALICIOUS

PDF

109.0 KB Created: 2021-09-09 20:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 188f5513a190d25c952983d03b0c373b SHA-1: dc632ee0ffe520e10b6b9ac0287ff2ad56f68c99 SHA-256: ba9f61aee166e1962eb439425f989990f1380f861195edf155ff4beec7a67357
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a large number of external URIs, many hosted on compromised WordPress sites and disposable domains. These links form a link farm, a common technique for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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 https://drafthe.ru/uplcv?utm_term=gohan+android+saga PDF link annotation
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/kf9kp6advt1kpkrn8mg8ns1pir/koluledavuruk.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613185115a74e---16560402008.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/dapotubiwuvupa.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/63218891015.pdfIn PDF document text
    • http://short-story.ru/upload/file/gulogamonovi.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/14968981073.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/4653991533.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/22014841282.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/50811416545.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/79843377386.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/nivavonivozaz.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/31108600174.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/tapoxuzaxopixusodu.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/pizibaxiwugobisewaro.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/mirenegebugaxesujax.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/ruvakekegotemivebixesufud.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/97271395448.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/zomejulizevoxudorowota.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/lutipa.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/qe389imnvvqrnri7j1525f46e6/76941257579.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/2q4vtenun2fltt8joeg6h4cji4/9112709343.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/13174755422.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/63972600587.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/ridovodetegozokuved.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/35211654175.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/28173180355.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/17501321148.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_off0001442b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1442B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C42 10292 bytes
SHA-256: 63ba688a20ca8a50e311dc1c503ece28cd53ddbea98829da8c429b5056bddd32
font_02_sfnt_off00017313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17313 19592 bytes
SHA-256: eb513b507f4c84b23d0d028cecff4332aee730f535a4d17ce9599409ed902659

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