Malicious PDF — malware analysis report

Static analysis result for SHA-256 564a02b1cf02c8dd…

MALICIOUS

PDF

73.5 KB Created: 2021-09-21 00:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 318e227cf5b4e2dfb06e6fe6532189c1 SHA-1: 564332d30340c6e13a90c4d0a9b430d363176cb0 SHA-256: 564a02b1cf02c8ddb35630654f38d789f63d0747fb599947547c1224b9719e3d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving phishing or malware distribution via these external links. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=once+upon+a+time+in+china+123movies PDF link annotation
    • http://alpinedelhi.com/userfiles/files/1546212166.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/2763029418.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/87758147442.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/pojal.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/9922867d6a5579645e2c42a1ea72ac73/valipakolugalurewewo.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/90dcedd548b5b8b05d33afd646fbbcf8/roredibazasomiwof.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/58053900541.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/movosasoda.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/84649848950.pdfIn PDF document text
    • http://netflor.pl/upload/File/61846608203.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/bijaxokizumapokiwop.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/pijozekojose.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/solaguvufagip.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/lazasusid.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f526a5e6ab---zitepisabobudezige.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/nixib.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/tugat.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/kibowanusabed.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sumuxexi.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/dalujoze.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/xumabedokoputefuxil.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/fexanijomutupomoboke.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/pexigivulixarowal.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109061023574141.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_off0000bb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4D 16920 bytes
SHA-256: 02e1e930e098ba191df9424f76b7d8790d7fce23641c95d2ce512d7023c7eb7e
font_01_sfnt_off0000e6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E6 11028 bytes
SHA-256: 4903157469df2dfb51d0e63c8eea24f9585c0f0ad5d0392a4364f43532c86128
font_02_sfnt_off0001008f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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