Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a2bff2d5ec6c05…

MALICIOUS

PDF

78.1 KB Created: 2021-09-20 19:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6f4d49f98e0651471fd103f53b443ef9 SHA-1: 46880137589f49534b96946f34365204954508c6 SHA-256: 45a2bff2d5ec6c05288a05e7a710453461e2247501b81f00d9ecb5260f5a5dcc
172 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and multiple links to compromised or disposable hosting sites suggests an attempt to trick users into downloading further malicious content. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/16e38569f4a7a221683a772784f3d090/79145297724.pdf In PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/kakigixafulisiduzitiv.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/14773996958.pdfIn PDF document text
    • https://laps.pl/userfiles/file/94574261900.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614644de29bbe---milifakija.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/1714704514.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/rifuxo.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/jekosodikalufuzegisewepaw.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/22067027537.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/66268911861.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/pedupigi.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/37702308532.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/88370727474.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/siwebugimafu.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/87469165514.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/raxejalitusozaj.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/pimobit.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/nebutugosedawe.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/wuvezutopusopovuris.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/13205729033.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/mudigijixeseluzor.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/78262629629.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0e10c070b---76894233621.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/38765422073.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/pudowaxitilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=download+game+sniper+3d+assassinPDF link annotation
    • 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_off0000ce67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE67 16720 bytes
SHA-256: 4841bd44fa8a9444fa25a9d226fae970da1ce38eef3033504d5c0246cd5cfba4
font_01_sfnt_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 10896 bytes
SHA-256: e007c9e1bdd9063fe67fac7ea86a51f6e5d7ace3358d1d32b99e1661567680a8
font_02_sfnt_off0001125a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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