Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e0e4f1f7e13b31…

MALICIOUS

PDF

79.9 KB Created: 2021-09-01 13:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f49d0f2bf0a5baf27c12d245b0f77f05 SHA-1: 471c080f0d504a100b409198af5f175cddffeb8e SHA-256: f8e0e4f1f7e13b318b289fa88948a64da4c0acb3dd7fd399e541d30edf5cfc12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=320+oz+to+gallons PDF link annotation
    • http://dgjst.com/upfile/file/38117768997.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/46564108464.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210716190010.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a4728191cb026a42f39a22f9e0610fd1/lotev.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d837cdeacf3---jawabemegawobiwivekiwe.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/12095695697.pdfIn PDF document text
    • https://ubranni.com/uploader/files/nizavejelaja.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/pepev.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/31171491255.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/kusepapulivetewumugof.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ce75b290e---jukekifefedujalar.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/ziwafudavosozijipunib.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/1e3d990acb4ea09a8e9c19e367acb683/98569763540.pdfIn PDF document text
    • http://kcobafl.org/ckfinder/userfiles/files/35724740126.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/minerarinawuzo.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/82396612920.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/0omukbhnjqearpj5p8asc3nq1a/49941194175.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/72126597526.pdfIn PDF document text
    • https://duvanco.be/docs/files/lukotovebumuborovogudir.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/71d0540a9c76ba557d70e893832fd3fd/wotajezo.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/fikanetuto.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/tekezokerosofi.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/c59f3278db3b691c0f73eaafd82c6b84/bavolobipup.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/besowinomosidipogimezon.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f62e7f7892697659e1595d743fdf4b92/23235516327.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_off0000d25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA73 10336 bytes
SHA-256: 810dd7630d70e3685f51da19f8e5da5ebd9f2b7994975e84e4db5db46e629c09
font_02_sfnt_off000101fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FE 18768 bytes
SHA-256: ec6dfbe96a6c75019191a6b3e2682a4fa1d937c5d2a625b0fff3d441faf4b1f5

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