Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b87f21e4e7eb6c…

MALICIOUS

PDF

88.2 KB Created: 2021-08-10 06:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf86eb87adebeb3531c9e6ca79011d88 SHA-1: 83571894a758a6d8d9f5f3630c1a728f2971c832 SHA-256: d4b87f21e4e7eb6caa1889864a928136323b9b1cf31c7220059e5d15c16f88b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many of which appear to be compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure of downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=free+printable+logic+puzzles+with+answers PDF link annotation
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160754c4501719---vokod.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa191251056---43833955475.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0e33c15db---xonedopoxojepupomo.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edad2d9ad5---dixoviropokifegakogede.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/komoxoxabupavofoxo.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/rodarirekemaratabe.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/meratinijakopez.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/68993422036.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a1a6ed0b3---rosoxadu.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1621396726.pdfIn PDF document text
    • https://tessuno.com/upload/files/60e222ad40ca9.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/19783835563.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202107242255132909.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/futusorowepobowirozobufe.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/72449683151.pdfIn PDF document text
    • https://senhewood.com/d/files/nekabulekafiwej.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kofemel.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/011723201476.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/83856395127.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/kabusukinuloted.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5d2b32433---97316799509.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa7695636d---tixinofatuv.pdfIn PDF document text
    • https://dcimx.com/files/17371226210.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f34912483---xalikozit.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/paxida.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_off0000f38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38E 17044 bytes
SHA-256: 923d35c82e5455dceffa21daf83dde00e6f6851555b2af1b01c9de719acc4f17
font_01_sfnt_off0001204b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204B 11016 bytes
SHA-256: 18045fc73d1d35e4b15d2e3dfebd67e9308517209505d5a65d954ade67c54135
font_02_sfnt_off000139b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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