Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f6192455553e13…

MALICIOUS

PDF

70.1 KB Created: 2021-10-01 20:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c1bd12ed12f4cc32d172c351f7fe7d5d SHA-1: a871581788ecd474ae13232335679eb448458a36 SHA-256: d8f6192455553e138388efbb3331702e02c5a1f80afebf825a66419fc333e522
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm or phishing operation. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the document's structure and embedded URLs are indicative of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=how+to+get+back+phone+icon+on+android PDF link annotation
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/brlqdormdcc1cih70fv9k4cjc2/57582894507.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613de59e4136c---sodulonim.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/duwofujadamigejumuvole.pdfIn PDF document text
    • http://iltorg.ru/upload/file/xufonodaxudubokamojir.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/96369945429.pdfIn PDF document text
    • http://domario.ru/userfiles/file/pefebulig.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/72839855042.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/xalitilodanozili.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/faniketakinegokib.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/lusozitifezokikejojadegil.pdfIn PDF document text
    • http://ahknchem.com/upload/files/69937487486.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/sajegadamefitajivijelu.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/30967745597.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/74483759389.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/jakixisafumuf.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613182a55ca5e---zanexajapazad.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a48eb4fa42---legemix.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/81203932456.pdfIn PDF document text
    • https://topupdana.com/contents/files/51870842841.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150b39dbb4fa---rafokisakazedaxa.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/xebulegeroxale.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/banekulaxafolepisewew.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/ive95t3ab2jq57okggjq5pd72m/42299773252.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/24146928128.pdfIn PDF document text
    • http://xsteelstock.com/d/files/buwudokokitatoke.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_off0000b595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB595 14564 bytes
SHA-256: a83c0a8d3e56f0141a95e0b0c72226f57c8944493201296d4374c5dfb357403f
font_01_sfnt_off0000d9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF200 10888 bytes
SHA-256: 2f26ec407683430b5f7aaa3de5649c82978b1a3c14b77b298d32a0f774c27d15

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