Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9d1ebb25ce5eb9…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 13:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ec669b75d7171827d34943664a89ecba SHA-1: a600bc767be10fefb9bfef939d6f658122f845a6 SHA-256: 8a9d1ebb25ce5eb99c76e0b1a02e393ca7b4986bdeaf6e02f0a6018a1011c36a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to various websites, many of which appear to be compromised WordPress installations. These links are likely used to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crewmak.ru/uplcv?utm_term=comment+fusionner+deux+fichiers+pdf+mac PDF link annotation
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0419fdb0c8---piwavawodafot.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/67770556054.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/75871738625.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/jezizobevobilodajuvenujok.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/60j1ffivnourak15a6p1gqsi2g/gupamufuxaduzewufolupet.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4f3f1da73---kovaxaralisusidut.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/tobekopidawoguzafumupogur.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/97523200201.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac97837af0---bemisidode.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b29235ea7e---lokuzekeget.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/vipibatupafadesefuve.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/82887115317.pdfIn PDF document text
    • http://havadisname.com/upload/ckfinder/files/viborijawapo.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/gizugunotavesefamoxokide.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/vugavaremusas.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afcaa3e495d---13118825767.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/3f1bc5bdc6ebdbea1044091550fe7f5c/70275923969.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/relimevaravujetikugaba.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/cnj8qb411ec1dgueju18juul75/58499946410.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160756b1076052---ninoxose.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/sukuvibunaveja.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/35864607409.pdfIn PDF document text
    • http://dentherapia.hu/files/file/55715354263.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_off0000d81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81E 19344 bytes
SHA-256: f2c11e782a24cb81bfdddad74ffc30bb7df85f953dda4d5f3fd0b9bcaaeb1ef5
font_01_sfnt_off000108d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EF 11072 bytes
SHA-256: f90a7364776adee3b33b48cab60089708af57ea5317c385aa4689285b9257956

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