Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4c468f2ce859e9…

MALICIOUS

PDF

98.7 KB Created: 2021-07-17 14:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5e3c58e83f4fb3523300c6787bf3f7b9 SHA-1: 60f9ad4f3a02b9699be03fad70a14741a3b0bc8e SHA-256: bf4c468f2ce859e9c0812a868ad9e43d902e35b4b7277ae5bee587bc05fff879
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://superplasticizer.cn/d/files/dikubuwuxijokizekafetowi.pdf In PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/87209414656.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072ad31c58b6---vubuf.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081c1816a9f3---91504247220.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/denexaxifonugawenij.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bdf6acd94---90763515732.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/sukuzavikokezekimelorix.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/piwaxadamegivemet.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093dcc4a6c48---53317179380.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/poxopupirugatixefijigosew.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec672bc04b---50882032329.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d35dd8cc6b---xujigivitubomibidesozos.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cf0899dbf---lixofajokunedajoz.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/716d42c4049b52614e5744ea1bb90bcc/92660694757.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/jaregeg.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/wereseta.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/4573782995.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd2d23bb70---15942731389.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/sadowujoxetabetumipot.pdfIn PDF document text
    • https://o-dance.com/upload/files/zovaromebowurupovoworupez.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/pajv9qu4lsar6vgd48603mattb/45671451543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=format+for+application+letter+in+nigeriaPDF 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_off00011f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3B 17716 bytes
SHA-256: 436a44953c592adfee124fca4e13ec261a90ff89a3454be80c034ac59de41569
font_01_sfnt_off00014d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001658a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1658A 10632 bytes
SHA-256: 5a77c45a8ffdd077653c0a9637dd0a31821119871c75a4b0dad262d660a1a250

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