Malicious PDF — malware analysis report

Static analysis result for SHA-256 d126f53186614f91…

MALICIOUS

PDF

109.3 KB Created: 2021-06-27 16:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5057767c1f5fcb85487f675c9a3292d9 SHA-1: f2fb89c43bcf4385dcd258dc19e75d667f1ddae5 SHA-256: d126f53186614f919b3ac71574be6b7aced65b5e6dc5958b91faee2056dc09a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous URLs pointing to files hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160879b20c4f08---tajomi.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6f37c2dd56886a90f9f5c29e82a70b8f/muwedolapuvamibozeju.pdf
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/e04e8ad5c89719dd623234a548dfb916/58999603403.pdf
    • https://cissud.eu/uploads/ck_editor/files/simixowubolaro.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/5734ej9m2kubf56snag5vp00g1/tavejuzisaluboje.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160984cdc4c928---bozawaxeditikojejipek.pdf
    • https://kurtoglumob.com/upload/file/rulewiku.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/49f35e87cecd6b8d8cad60279e5f5c2a/pufusijaju.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b384639608c---33107425582.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd709721ee---57415871492.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16070587f97901---40541347925.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607900c5e5798---85648908661.pdf
    • http://duepassidalcentro.it/userfiles/files/74276784789.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160727ea7ae482---69176381589.pdf
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/kiferunuzixefig.pdf
    • http://chixue.com/uploadfile/file/20210522045733.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853407c4079---94405834443.pdf
    • https://ahha.az/userfiles/file/faserekimanokirumurozajor.pdf
    • http://oreade-breche.fr/userfiles/file/28720965071.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087593fe5de5---kitodazilawekifixinisudaf.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7b2d515d05843043b832a52a7d86de2a/26654823204.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/3e11bbd30d220e28648ff4b33755dc53/davakexegonokiwopolejep.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9ejtkakm17iacu4s1sifg8tbk3/vazepofajovijoti.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=noble+gas+notation+chart
    • 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_off000148a6.bin
03d71f61fb4972926e05e404d6906f7cbc8d9a13df5f8c7e53521b823bc7080f
pdf-font-stream PDF embedded font (sfnt) at offset 0x148A6 10628 bytes
font_01_sfnt_off000160ec.bin
2a390d8d546678cbe0f530abc2c81a867ff8e23b190418ba97511869f8a3c1b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x160EC 17716 bytes
font_02_sfnt_off00018fef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18FEF 16792 bytes