Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8eb9c93b3903a6…

MALICIOUS

PDF

80.7 KB Created: 2021-09-10 17:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 24f816d88d58eb51d438a56d33c05fd1 SHA-1: 536c400efd28e14d4b3e62037672a121426a4fcf SHA-256: 8f8eb9c93b3903a65aeda6355f7ed896d5ee37b3073a1723ee3a1b1027d0d171
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=dual+boot+linux+windows+10 PDF link annotation
    • http://henzefashion.com/userfiles/file/54482566683.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/ririgowowaweluwabumed.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/59960198613.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/43865004037.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/61017172507.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/diwozakekejuvavujov.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379385f2544---59872279169.pdfIn PDF document text
    • http://brenderup.ro/mm/file/55519077801.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131c7651dd03---63058609857.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/bijukapizevosomufaxopo.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0322256001630929879.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/57847189258.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/kidonagotekewedutevone.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/98405651004.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/8f2226a579f5445f902baf6800f5863e/kunebizewatip.pdfIn PDF document text
    • http://abwva.com/uploads/files/27384457077.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/26010435634.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/7460655144.pdfIn PDF document text
    • https://lecachet.fr/docs/files/61274521182.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/gobevewojugobisoririg.pdfIn PDF document text
    • http://hkacca.com/userfiles/23117969354.pdfIn PDF document text
    • https://megashina24.ru/files/files/31488040144.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/livoleximoved.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f919df4c0---41929884875.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae3ea131f6---delipodozutevofamavagit.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_off0000d626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD626 17932 bytes
SHA-256: 506d7fc552672c8a8c05864e7c55cd9ef495d92ea3e4705e9055f402b43150be
font_01_sfnt_off000104dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF3 10612 bytes
SHA-256: c6efd3e533327d17eb0b1a19257cf0ee826f2a0d9fed427321cf188533594dac

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