Malicious PDF — malware analysis report

Static analysis result for SHA-256 70921cdcfaf8d02a…

MALICIOUS

PDF

89.0 KB Created: 2021-09-16 20:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1cfdb6591cabffda02776c1a3968f6de SHA-1: 06c41e0719026fd0d00bb90098a949df56befb74 SHA-256: 70921cdcfaf8d02a019ee7d8d68ba43aece9f2b61b6fe843cb6f34b312cc2210
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://huntic.ru/uplcv?utm_term=incoming+call+ui+android PDF link annotation
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/02d6577b2a7d70357bddd16ec37ddf1c/tojuzizoluxusekokalaf.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/2109120526058212344s6m2c.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/jofaberodeweregafiwuditu.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/duxabovudomumevivodam.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/56075234349.pdfIn PDF document text
    • https://langumeistras.lt/i/File/49639063822.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/187739756.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/79571517969.pdfIn PDF document text
    • http://tabletopad.com/images/file/baripetedupukebofugezotid.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/zekuraviwukujaj.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/fubiguzovubuvumeke.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/wonuropevivozobab.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/66465495577.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/81509952570.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/vizatebobotatejulodas.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/bafusumuxepadizaluro.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/614285cbd389a.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/11818833939.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c5d28676f---bizozusixidumotalalatifal.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418006b91a8---zagunozefo.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/pafuvilaw.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_off0000f689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF689 18520 bytes
SHA-256: 1de3c99926439e52d32668b457584088c078ff22ba539551d2c5f8a6f86d4d45
font_01_sfnt_off0001275a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275A 10368 bytes
SHA-256: 3b27d6a69675846fc8bab77ed7159e653dfdd27f49511d3f28c4a3544e33b84e
font_02_sfnt_off00013e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1