Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9240bc177d911ba…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 19:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9180193b2730099eab5c803008e458ac SHA-1: 1f7ca36e194ed6b128da0867b5e3a461ef00a072 SHA-256: f9240bc177d911ba2860e3a80c39bc8b171c0bd8c2197442af81979a76989b41
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are hosted on disposable or compromised domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://carcable-bg.com/uploads/pictures/files/12076434626.pdf
    • http://standardamulet.com/files/files/kekagavobawiwetuv.pdf
    • https://stealthwindow.tw/uploads/files/202109170759153534.pdf
    • http://brcassociati.com/userfiles/files/xonavivazojilif.pdf
    • http://groupkaishan.com/d/files/38816845070.pdf
    • https://fleseriuassociates.ro/files/file/24040459564.pdf
    • http://sincaremedicaltour.com/js/upload/savafuvamigejufowiwilo.pdf
    • http://pho32shabu.com/uploads/files/tilusakifopakulufilibixeb.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395cef044e1---24377075142.pdf
    • http://bantinnhadat.com/users/files/petidukebovakubotitox.pdf
    • http://envigest.cz/upload/file/judinixiwabazipixawokuba.pdf
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/30700805912.pdf
    • http://phunphu.com/userfiles/file/58742131439.pdf
    • http://kvarkeno56.ru/userfiles/file/8463301030.pdf
    • http://bandbaajabarat.com/ci/userfiles/files/dodazogu.pdf
    • http://pibar.tw/uploads/files/202109030049339602.pdf
    • http://kantipursecurity.com/userfiles/file/25382485110.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fce38cf7c5---gulemadunefasofipirise.pdf
    • http://bet-balance.com/userfiles/file/45703160872.pdf
    • http://iphonedown.com/ckfinder/userfiles/files/56116423351.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ec795aa98c73f02edbc68d9f284c5b7d/polirowevizamisogeli.pdf
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/pimububejisobavoraguzunun.pdf
    • http://paradoxine.com/upload/files/95276535710.pdf
    • http://lokalsport.no/userfiles/file/xuwelifozipovitodopazosi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pdf+xchange+editor+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d97c.bin
ab35bde27c24832409dfad3e55711677e68abd1f2fc13f263c92430d45c96166
pdf-font-stream PDF embedded font (sfnt) at offset 0xD97C 18860 bytes
font_01_sfnt_off00010a3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3C 16792 bytes
font_02_sfnt_off00012253.bin
b856474fb61883aecc132dd5744cf1d1083624c682d08f8a8472bac145ab39b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12253 10644 bytes