Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a73245a2d9a2d09…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 22:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 189cfb632963314c48cff63da4359aac SHA-1: b0ef369d47b5ac9cc640b5ecdd0a11452e20d30a SHA-256: 7a73245a2d9a2d092769e759a00d2224ec7b5e8f46018540e11a99e48a215142
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing lures or downloaders for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://mn-print.ru/ckfinder/userfiles/files/fedefifixefona.pdf In PDF document text
    • http://tanabuauto.com/js/upload/files/95944818733.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/38266615320.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/55435110210.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/woxebazuwulitozinabeji.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161382674491b6---zunixonadedaradagezisoduj.pdfIn PDF document text
    • http://meditopthailand.com/file/73364520852.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/43666464258.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/52782863131.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/33078023478.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/67146195758.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/82581902772.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/dfd3d99076fc1e9b510675a211069c46/zewevotozi.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/jalebibe.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/2712176833.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/wemetinebivukepokajuve.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/29198815760.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/259858299afb2c6084e546b6b6b86849/muzazujopugajiwu.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/99500371920.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/83038046850.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/40092287494.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f2d80f442cf45ebda00e84b0a8442b10/rusewugutifabewoduwe.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/2489910529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+hard+reset+android+tvPDF 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_off0000da19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA19 10440 bytes
SHA-256: a84a1b2b4203ff69f17097cc38ad8009b86f2596f1cef3c9ada228bddc40ae5d
font_01_sfnt_off0000f1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BF 17904 bytes
SHA-256: acd1eb319f366302edb97d01e43d0097207e3f74b1f39b4defd21ea68ef64736
font_02_sfnt_off00011f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1