Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7245428956832b…

MALICIOUS

PDF

78.0 KB Created: 2021-09-15 16:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6f7bcd272181c957ea8256e424635623 SHA-1: 6c230e2b57c4685c0de84d282639bae692a90c9a SHA-256: 1c7245428956832b63b0c40dd0e2040913d19ea327a2ca6b7e7635121ce6a04a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised websites, which is a common tactic for phishing or malware delivery. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser.

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://himalayanthailand.com/image/upload/File/sigaz.pdf In PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/h3an9co231e69lmceuidi3evs1/51967814891.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/bilitatatitevufidifelir.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/88525998538.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/kokob.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/38211378752.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/pexirajafabibidum.pdfIn PDF document text
    • http://rsst77.ru/upload/files/10717595205.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/19390029807.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/39714543775.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/82033659939.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/ranotirozivugowizovek.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/jifomedoripogofolezulexib.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/sonosaminitani.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/80199163460.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/bosiverizedetemovi.pdfIn PDF document text
    • http://debten.net/UserFiles/File/fofedixe.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/tofenoke.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/kubujuxaxo.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/mlk0jhbb2qra2a8a14rc46teo6/75422120714.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/60064488038.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136e20f7fcc5---90149241070.pdfIn PDF document text
    • https://bloc-immo.com/images/xademiretuzukututet.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e01da2e0dd---11372242268.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/30563528311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=shadi+main+jarur+aana+full+movie+watch+online+freePDF 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_off0000cb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38C 17676 bytes
SHA-256: e7467ec0a7e7f72b911297094da8caecedc3d69e2e5ae1f8f7f16e86a44415da
font_02_sfnt_off00011104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11104 11032 bytes
SHA-256: 7cb9f4df6b5f680e3eacf6d02f428e0b6389f6c69173254e9a22173e6b3df2d4

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