Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8d3e07ffb0d80b…

MALICIOUS

PDF

78.1 KB Created: 2021-09-13 23:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7cb47ee876ed279896cdd1e7c535d46d SHA-1: 8a50910501af7910928f256f0189e469e01b788c SHA-256: fe8d3e07ffb0d80bcae610251d29cd880ffad9fa5c5f08caabccbdcb86c9ce2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://pixomot.ru/uplcv?utm_term=antutu+benchmark+redmi+note+10+pro
    • http://gndpta.eu/news_objects/files/jorim.pdf
    • http://sungwoo-n.com/userfiles/file/71266234283.pdf
    • https://tedesco.pl/userfiles/file/50194292909.pdf
    • http://bastola.org/userfiles/file/bumodezoforazebi.pdf
    • https://palet-school.com/files/files/81315005720.pdf
    • http://solamsys.com/userData/board/file/88324094142.pdf
    • http://kidzcastleschool.com/singhania/downloads/file/zuruguja.pdf
    • http://telekommarketing.com/firme_data/files/medatanenetoz.pdf
    • http://cameralehiep.com/hinhanh_fckeditor/file/rosiporipajedip.pdf
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/zetuwaxivemaforogafaz.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340f566b21a---biwimamusiz.pdf
    • http://knshzj.com/CKEdit/upload/files/woretuz.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd771e7f45---62402919928.pdf
    • https://artenika.pl/fck/file/6181790718.pdf
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/mebitesowusonimevojegowu.pdf
    • https://mayxaydunghoangphuc.com/userfiles/files/2073975344.pdf
    • http://zaintik.org/files/galeria/files/60429153367.pdf
    • https://forumsevens.com/images/file/68710471469.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/7d3774a5c80815133710e26c26e452e2/jutakumizubidivaguwibap.pdf
    • http://newabel.com/ckfinder/userfiles/files/99427510247.pdf
    • http://salamino.pl/userfiles/file/40406395424.pdf
    • http://s4l.vn/storage/ckfinder/files/98637702958.pdf
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/51295660187.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/c5b96ef58ed912df2fbecf177e90dc61/lamamoniradazeka.pdf
    • https://hobbes-group.com/upload/files/lilabepolesogukevenefabob.pdf
    • 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_off0000c8de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DE 16792 bytes
font_01_sfnt_off0000e0f5.bin
c2f3f2e08ba83c12b24aa2502caf607a66c576e9145e27854e27c53c28727a4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F5 11052 bytes
font_02_sfnt_off0000fa4f.bin
8200d384648e0963f940c07548745af105ef2f13e49be1419154817df7be1958
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4F 18460 bytes