Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc190b4259eb8cc0…

MALICIOUS

PDF

70.8 KB Created: 2021-09-03 01:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 018a9e3a984ba7af617999283ebae0a1 SHA-1: 33a0d58d62390d93795e417cd14873529d9a0a89 SHA-256: fc190b4259eb8cc0a835556a37a402a7c0f9b4cbd9cb656bb169aaf08678417a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to external resources, many of which are hosted on compromised or disposable domains. The primary purpose appears to be directing users to potentially malicious content, likely for phishing or malware distribution, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://bienenaktuell.com/sites/bienenaktuell.com/files/file/mubupidudatalubomoguwa.pdf In PDF document text
    • http://pho32shabu.com/uploads/files/68818616798.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/tazixijupogiza.pdfIn PDF document text
    • http://www.buildonhope.org/file/46227112351.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210614183801.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/kaxodagegazakamewixozax.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7509a65d9786f0f2ea3a3110cdba274b/jogaw.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a427f22b984---995789857.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/79639247484.pdfIn PDF document text
    • https://ubitanduk.com/contents//files/8772640243.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cb2d5d3d7---woriwedabixafemepunagibas.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/joninirifi.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/87213406233.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609845b60304b---simaras.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/lediwavomezoxalepuvisomof.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/letonadukuse.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/wuzonurujawin.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/vugelagixef.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/36902752541.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb73698da02---90678118892.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/63235456784.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/62812029854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ganesh+varad+stotra+pdf+in+marathiPDF 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_off0000b0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B9 17192 bytes
SHA-256: b72dbc8f5dea532e3661cf0d32a4d7b4b82af461c6e56edfbf11fc538f383865
font_01_sfnt_off0000dcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F0 10820 bytes
SHA-256: 3883bd627f2e2027635181f8481cb5aafd71a772cd8fcbbb54bc0d09a557782a

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