Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb25d71f98ecd85…

MALICIOUS

PDF

74.5 KB Created: 2021-09-04 02:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6b8150df202613f92b9b989f704d0c15 SHA-1: ed52ac622d7716c689ac8950f5d1d5b2eef9e259 SHA-256: 4fb25d71f98ecd85d069e52e43ac25a3fabdbfbe868ea4e5786c2473a83e707d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://elsekmont.eu/userfiles/file/6217101414.pdf In PDF document text
    • https://deltagroup.bg/uploads/file/jumulebenukiwir.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/40041025402.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/xaginowiruzubiti.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/96c4bd2017b364e8a86fd6618bfa5b2e/89688792390.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/9839781054.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/wixisugara.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/lekumawozabodebapivuvi.pdfIn PDF document text
    • http://hak-al.com/resimler/files/buzemojuzoforusatejob.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d690389fbf---28768252006.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/46023341032.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/96448343860.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3491f932---linivim.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/pexumefewusibawisidije.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/82395790725.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/lawewisev.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/gulavunutaporevelezokit.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df42f0e78f9---65268889672.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/fedifujuxugufevisazog.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/e6aa0800d0dc5aa1b312ba4f76b6df8d/fizabuwe.pdfIn PDF document text
    • https://go2germany.ru/files/file/71052669932.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210819230757625944sedxi77om04p.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160913481910c7---wasot.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/52183620267.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/savotijapuliwizirasum.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf8900601---pininelokuliladewitoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=gopro+hero+7+black+manualPDF 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_off0000bfae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAE 16728 bytes
SHA-256: 54adca7e06423f8bce88ccd225d074306c027a99aab16eea13310867046cc463
font_01_sfnt_off0000ea3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10252 10700 bytes
SHA-256: 2d0d005606975f0f91f03af6ab688fc73f3d369e85928fdfe1d199a7e494590d

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