Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c48de3f50f2a849…

MALICIOUS

PDF

78.8 KB Created: 2021-09-07 06:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: deb2ee257cc7c2dbe9d0b475f662d149 SHA-1: c15b7f2d8ac289338b765b9d7c047eada43e69e3 SHA-256: 8c48de3f50f2a84912603a6b665449eec65155651fa9ded8edb34e4ebd250ae7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution lure, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=absalom+absalom+text+pdf PDF link annotation
    • http://canvangdientu.com/images/file/xezotenezelawenisu.pdfIn PDF document text
    • http://harrisonsfamilyreunion.com/clients/62911/File/dokamuju.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/wipawubudeni.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/75436437706.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/6408ea428644087e1ac43f12d612c30a/68813199030.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/1931171410.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608117f607158---91123389477.pdfIn PDF document text
    • http://goref.ru/files/file/34252461060.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160836214bc1d2---33402591956.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/vl0bg1m0t4ups5a5d96ncq6222/xoneviligaxi.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/veludivitul.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/wafamakilosixidoxewaza.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f35ed679fc---30225834383.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/86954391236.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3d82cf5069b6bf60a2d0a6d21ca6bc77/72814842610.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/lugijokifubukosavogutigez.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/kujezepekopibegozig.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/41509317546.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa051232510---28410877124.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a65335e78c2---91141849259.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/75053280796.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/56152465687.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/98078329399.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/64105361741.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_off0000cefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE715 10584 bytes
SHA-256: b137d56c3da4e2409817cfe274b2ad411ee9120c4493b6f676c62de4d841f990
font_02_sfnt_off0000ff27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF27 18096 bytes
SHA-256: 4e5c60a932fd30391ead95bc43bbda513c93fc7421e44dc20793ce398d9765ca

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