Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b53140b8e138dc…

MALICIOUS

PDF

83.1 KB Created: 2021-09-21 19:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2598714dec82afcf54d8486505674386 SHA-1: b4dd0b36c2d954824ecc8def99120123f9bbce9f SHA-256: f1b53140b8e138dc2289da94b13331d572fecbbde520a9adf13208a760e74d78
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised or disposable hosting sites. The presence of these links, combined with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM', suggests the document's primary purpose is to redirect users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://archism.ru/uplcv?utm_term=free+song+downloader+app+for+android PDF link annotation
    • https://kaptenhoki.net/contents/files/kugiveromag.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/ec7531b0bf270d905cdbe57909779e47/20561619169.pdfIn PDF document text
    • https://ka-base.no/images_students/files/71307872870.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/kojebuvuwuru.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/55515894975.pdfIn PDF document text
    • https://il-gusto.com/images/file/53089872573.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a04b0e6830---xozigaromi.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/49983138868.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/gegotinugagomemikixefas.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/pisomebilekisanozizux.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/1784915365.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/renelezorow.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/32437478384.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/luwegikigibuvitazomoki.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/gitejosefapamotuxuma.pdfIn PDF document text
    • https://oktatas-konyveles.hu/term_extr/files/1963221071.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-14/20210914182536973286.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/pojitu.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/81756913745.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/putoja.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/66916087447.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/23f27fb3a7877c578179221c77787d58/worobalapafe.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16148b2a69abc4---91840710237.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/88351816932.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_off0000e13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13C 10640 bytes
SHA-256: dcd0e0981ab98dc99bd9a808a943c9b47ff68782a697c0b29ec53d964ef5ba13
font_01_sfnt_off0000f981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11193 17696 bytes
SHA-256: 21ad88dd1951ca9e6555d8aa04ee252f77f31a7d4beb61986c491356d356dbce

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