Malicious PDF — malware analysis report

Static analysis result for SHA-256 8996321986593b57…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 12:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ed7ae538c16589a548b4586a79d17757 SHA-1: 66f6171cbf8d9f66f0fc9ada58ab7f9b12d57c99 SHA-256: 8996321986593b57091b7a001a2cfa44320a8dcd691ee292d0799d60af80d69d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://crewmak.ru/uplcv?utm_term=pubg+lite+galaxy+store PDF link annotation
    • http://maslatalaia.com/userfiles/file/sebilisegibijixan.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/83678368850.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/vepegusenoxala.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/57631143451.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/mejawat.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/55585847262.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/fivad.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/pebisut.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/88afa87646b805c56ff5ee6b37d15996/59992048306.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/8869777019.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eab0d2d7a2---sizomibuganugot.pdfIn PDF document text
    • https://seikai.jp/free_images/files/96427192902.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/kugizaxilapadatixe.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109031930087884.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/nelexa.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/655a5c76114714db8535379a81cf572f/dobewijixutijunu.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/18872364484.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/83958279982.pdfIn PDF document text
    • http://xahuaheng.cn/userfiles/file/49052838605.pdfIn PDF document text
    • https://grouptm2.com/contents/files/43780999464.pdfIn PDF document text
    • https://recrut.com/files/files/vimupuritojubov.pdfIn PDF document text
    • http://sbkf.org/files/files/44519704383.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_off0000daf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF306 16980 bytes
SHA-256: b75a287f8a4a76c275a1f67b72c7108f050dec4bd3d6c637ad652b617dbd1fb6
font_02_sfnt_off00011f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3A 10636 bytes
SHA-256: 0ea870a540a2d7b5f6cc9f420be04132eeda176fd2c728c34e75a3caf60eabdc