Malicious PDF — malware analysis report

Static analysis result for SHA-256 668789d909af7d2c…

MALICIOUS

PDF

71.5 KB Created: 2021-09-27 00:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 00306769e9e999d2b60553a96c443c8c SHA-1: 458954202d2771c0113972a3c2efa5b8996dca56 SHA-256: 668789d909af7d2ca12828cdf595ac5bcae29293ead65d179f2fe7845f793a38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. While no scripts were directly extracted, the nature of PDF link farms often involves JavaScript to redirect users, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://studiospazioambiente.it/userfiles/files/90948597553.pdf In PDF document text
    • http://com123.vn/uploads/file/47970284648.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/42228567960.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/bojodogedidot.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vamuxexigilujikogosura.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/82476786219.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/turuzogezededenew.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/vupamita.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/junimiribinikemewuvefaw.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/7df52652ba36608f2f3c95e9258c03fb/6855861288.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/4723377750.pdfIn PDF document text
    • https://sunrisemotelbellevue.com/nbloom/fckuploads/file/83157670214.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/wudekiroxozisusanoxizafem.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144aa5557541---59217715914.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///96104383417.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/2688b96c70e6a3485ea45a28af87564e/belaletuwisimafeba.pdfIn PDF document text
    • https://loyd.rs/images/file/velezorunawerakuli.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/64317500883.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/kaxifodale.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/zawobedefogerer.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/53138882312.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/60242070144.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/90037565349.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/xewomabakiwijawubibibaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=videoder+beta+downloadPDF 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_off0000b2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC4 18408 bytes
SHA-256: b77e3ed3051b2191207ec6b6453432962e9384b12d606fecc2fb78b4f7efed20
font_02_sfnt_off0000f992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF992 10268 bytes
SHA-256: 75c251465b0836203d2fc41a24c588b8c13a8b2a9f7dda151af2bbdbc646fc26

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