Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8f99cc60e5dfc1…

MALICIOUS

PDF

95.8 KB Created: 2021-06-27 21:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 03daf063d7dff3d0a692555458f1db79 SHA-1: 1634a13a3dc1a7d73f83bd77fb9de0d350a43f86 SHA-256: 9d8f99cc60e5dfc105cf2fd58ad0c471e09ca394eefd4db870970ca381f3187a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://philabc.ru/uplcv?utm_term=convention+for+safe+containers+pdf PDF link annotation
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/f01a00865d1bade7987946116ece534c/vuxiziderexu.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b93f909765b---96177463463.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/tg8jm1kc52rn136nffkf99sjm4/46018093182.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16090c1ba67e4d---69684285038.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/835d357bdd46e28fb7c0d45e24fe82ee/55873434471.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072adba29af9---86601641973.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ec032ad0ebb98750fbae44be0e92ab87/wafewukofipixokaret.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/nugipimafolifukivirunez.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5346e94d83---92281392396.pdfIn PDF document text
    • https://vestol.bg/files/file/sepinizovoborivopuluj.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/3c6cbfc4d4ae5141ded8d5c4bb5e79f1/63124366992.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f5440d78f---bifalodakojik.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/qjdbco7uujhl9f6ne7h4shdt9o/vomoretudazisetigobigo.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/3fa3347790db10f5919c1370f7cba6eb/92182938670.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836c46c136b---xuwuxikiramitutisobir.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/7ov7efc302qf33vgbkh2isf8vv/kalibewekatad.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/2a0f4f79811cf5632e19c2739297a91b/85309194800.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/p91q0u12f0s08oop6fdgm87bkb/wafazoz.pdfIn PDF document text
    • http://flexa.cz/docs/file/59831664254.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/nisofajofeb.pdfIn PDF document text
    • http://llux.vn/uploads/files/jonuvawes.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/53511349477.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/53c137c02b8b26489899a6f985ac6d47/vosuso.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_off000112be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BE 18040 bytes
SHA-256: f94a92af629d6fc3c718e1fc36e306bc2e2e9847d06cb825cd034ba4a7abb5db
font_01_sfnt_off00014160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14160 10664 bytes
SHA-256: 4a4869b81b2a5603b3892495257f116188d9e7ec67c6d49399c53f8d5d299c96
font_02_sfnt_off00015a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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