Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6dba0ab7f5a108b…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 08:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 888bbe6621f0e1cbccdab0c6753b1b44 SHA-1: a6806423433ebea6cc766311a8beccafed193c1f SHA-256: f6dba0ab7f5a108be2d7b14f923ce8f7d8a6b7e600a815d19e3daba4fb0cd4b2
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to various domains, some of which appear to be compromised WordPress sites. This suggests an attempt to lure users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=how+to+look+at+someone%27s+profile+on+instagram+private PDF link annotation
    • http://nagymester.com/userfiles/file/80708032650.pdfIn PDF document text
    • http://esistore.be/userfiles/file/93665526500.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/tegizibajapefanomimijobik.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/74244996588.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/xatuvododekapakemi.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/kofonisuwatatabokaroku.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/6081aa5a190dc72870e512563b149862/wekewoxag.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210910101121.pdfIn PDF document text
    • http://ihdbd.org/upload/files/kenesewomab.pdfIn PDF document text
    • http://apart1day.ru/file/99567847068.pdfIn PDF document text
    • http://vitccorp.com/uploads/userfiles/file/pulapadorixisizunenugo.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/41319584021.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/41124917115.pdfIn PDF document text
    • http://wernitznigg.at/files/59477921421.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/48687368518.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/84855713061.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/xurofetusiwivaxoraxowafem.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad79bb487a---guwululuju.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/22a71e0533b3940a0ddde0c31ad47c13/bagegunupo.pdfIn PDF document text
    • https://eclearusa.com/images/file/kojotekogudojowup.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/20678038577.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/78356157967.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/42084881344.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_off0000d5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 18548 bytes
SHA-256: 3c6fcf1e8a7d0b3982f8c6a598b6367f4d3dc900a2016ed77c0bc59b6b386f3d
font_02_sfnt_off00011dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC5 10972 bytes
SHA-256: 09fc4246e6c415b355a54aea2d390621b19289e6e48d303941949b55aba3b591

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