Malicious PDF — malware analysis report

Static analysis result for SHA-256 2678af727a523d92…

MALICIOUS

PDF

86.8 KB Created: 2021-09-03 01:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8f2396d7db3682522de38f4fbe7484c5 SHA-1: 2f33d28ddd9704ceb4d6ab228582d0f439727738 SHA-256: 2678af727a523d925d7ade21b0bec4e865528f8941ffd7c0ccd1d7a5b1824d9b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to external websites that host other PDF files, suggesting a link farm or redirection mechanism. Several heuristics indicate these links are used for compromised CMS uploads and disposable hosting, pointing towards malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://royalgoodviewresort.com/Uploads/file/putojuvatakubanaboloj.pdf In PDF document text
    • http://propellerclubsandiego.org/uploads/files/wisolulekij.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16121b4c123940---5609723767.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/he8t1dq1dalnjgr2dghjdslc6o/20517660656.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/zamijokus.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/pixelikema.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/19991319733.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a67684a56---57671434068.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/dawanosesuladexifol.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/mupuxogenaxemab.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/4e4bd9413ae9fe0e6b21de28437a63e7/71750007570.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e81b71ff34---91725914767.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/sulivujaxusuxumevakawur.pdfIn PDF document text
    • http://emannsltd.com/userfiles/96989818430.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/wipuvak.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/44998394319.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a56fa85a81---1830457666.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/salogajepodujezizewusudel.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/fg38liutds9p5a0ceffcrqq3h6/98590153963.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/0vtp1n8lajdai3fg4b2t9p2mff/46071427007.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/metuxuzoba.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/buxadorenipadasufidaluwi.pdfPDF link annotation
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/fbadb6b44c2b06d616f8b108478247d6/lenusogizurebowumomobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=graham+allison+cuban+missile+crisis+pdfPDF link annotation
    • 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_off0000f0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 11064 bytes
SHA-256: 917614e382539c45342686086c88224aca9093673a3cc799ff22ba1294e52401
font_01_sfnt_off00010a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001225f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225F 16912 bytes
SHA-256: 8e1107ac84d3955bc88fa3e68b31ab798bd7880daeead7f6cf9bebbdd478b176