Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5dfa611724bcda…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 11:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1c5a8dfe05a293ffe7577c3576d57ec0 SHA-1: de2e160e90136429c40c37579e2908ff16c18bcb SHA-256: 4d5dfa611724bcda4353c56aa932f40d81455d80de94464c65ab899610d9ac86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL analysis point to a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://laborke.ru/uplcv?utm_term=ps4+rocket+league+online PDF link annotation
    • http://1000projects.ru/upload_picture/file/rivazudepi.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377bc9b6758---kamodof.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139f45280987---nefejudiboledev.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360e32e1494---desasusupuxafuxexoselaju.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/letakije.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/45182112949.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/21399965053.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/kavolat.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/94004819602.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/rotoxarezovepezul.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/60731326753.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/zenisivivuritefogilotaro.pdfIn PDF document text
    • http://koala-al.com/d/files/49806959958.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/21745758764.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/7713968627.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/kaxadunonukogufubuxore.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/68755887350.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131ad9d3aee3---28709373266.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/jefexemubenulutula.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/28ddaaa3254544aaab6f8a1b7183dabd/nipumim.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/61036130022.pdfIn PDF document text
    • http://101balkon.ru/upload/files/52333733315.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/89836159360.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/46474340845.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_off0000d6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F7 18148 bytes
SHA-256: ca97b61bb8a0f28878f8777bd95b89220dcd25f66e0216ea40340f8c8d67ff42
font_01_sfnt_off000105ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E16 10676 bytes
SHA-256: 77f445b8cedd5ce8f153e141abd3799a64e5f037ff477a6e58e077a6cd876008

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