Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee898f1297afb668…

MALICIOUS

PDF

74.7 KB Created: 2021-09-13 08:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dbe78a5fc31181af96d66f5cc3bd9278 SHA-1: b71069556845a2022b8ba1e4b044ee0191470edc SHA-256: ee898f1297afb6688b674835c8f79b48e9ce361617393505dbd780f026d2f09b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=physical+chemistry+book+for+bsc+1st+year+pdf PDF link annotation
    • http://www.thaitofu.com/image/upload/File/dexajimapamuluxaminiru.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/72545038712.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/nedeb.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/kowiviratuliwamozono.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/31603609742.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed7bf18a1c---fefabumariwexejexuwixe.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613366d1b45e2---pamazaponelomujuxe.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/33748849149.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/80525090193.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6eb0de069---41358255468.pdfIn PDF document text
    • http://bushurov.ru/images/files/92822894704.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/1ca6a3690b016fb863a4bdc1d8507e2f/zonokupukatisomedoro.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/77668975768.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/tejifawabaririwavuluma.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/oqfur1mpr5fatu22fobf0qkjlt/91801868265.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/36690772399.pdfIn PDF document text
    • https://seikai.jp/free_images/files/67464684950.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/vozuwuwo.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/91917477915.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/vavikatijunotu.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/62205385619.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/84852161657.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/80263694831.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_off0000bd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD36 17660 bytes
SHA-256: d10a51da488456eeadcdae11335f5172bdde0360cd3421da50d8836c1e1c08b6
font_01_sfnt_off0000eab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB8 11180 bytes
SHA-256: 1de288b4ca8b69c019421a67996b0b4da687dcadd3a45d14b8e319f55d1118bc
font_02_sfnt_off000104bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1