Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b413b5d1ebed23…

MALICIOUS

PDF

85.6 KB Created: 2021-06-27 05:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b03adb6f6c31490e8ba52223817040c9 SHA-1: c71a568339ea156e4deb88b654cb1d7c985666ed SHA-256: c9b413b5d1ebed23b1787811054eb3493710e8df0c260cbf0e7a241a3a32d60b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS upload directories, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the overall structure and URL findings point to a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=any+video+converter+crack+download
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/6f84af9562d293223685581267b40e79/fufonejixaxuwiri.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/3c8iem017eouomevtj4geqqc6g/rejewirasafo.pdf
    • https://legouic-peinture.fr/userfiles/file/ditogodafof.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/831622708.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/f513497d7b4ba2870086b883b08bdee8/fetukamomepomigazidu.pdf
    • https://facades-et-traditions.com/actualites/file/buzakunekejowe.pdf
    • http://nowyhotelik.pl/userfiles/file/jonovoworelukedazosutu.pdf
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210525234920.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/da86a5d7c67ddeb952b5d3c58b7fd809/mowifuzi.pdf
    • https://rowadalbyt.com/userfiles/files/fujaxagazoxiwavagar.pdf
    • https://seerupit.dk/assens/file/nujuguzevusutofa.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c40e9b470b8f76eb3a9968c60630d56c/vurazobazuzasuzifi.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a6d40c347---83203591302.pdf
    • http://barcelonasixtytwo.com/userfiles/file/diserisesijosiwowo.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/9vcjvhc991hq48u92dltn042n7/pudefupamesi.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940d7172775---finewabipimafuditetobuwob.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a89a618a331---dirivepugigexesupuwopebel.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa83adf1283---tunimufipuk.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba34b16f86---tunotigoxemurabizo.pdf
    • http://aucoindeshalles.com/menu/file/muligu.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/gqktc51fg3m1ttpb20pbl15d2s/dejujamamoxosixuva.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/9d4949d323ff20bbf65fb5e5666b11e1/11570459667.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/1859f62411bbaa9ff33aa0597af28d9d/wapuridegikubamuni.pdf
    • http://andlupa.com/userfiles/file/kodejimosivujuvanir.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/5fc5e1b0e1740a9c88e3691a84cd8f9d/96181745783.pdf
    • http://articolo17.it/siti//usr/foto/files/parabevewize.pdf
    • 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_off0000ebbb.bin
e45b83639f09a18af2414e44e188ae324506c93b3d6bc1efe806e4b5177ae737
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBB 16712 bytes
font_01_sfnt_off0001171d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1171D 16792 bytes
font_02_sfnt_off00012f34.bin
037a84ae795a1234e902decac59e116d332173e3791fcc84f1449bf78e04c83a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F34 10532 bytes