Malicious PDF — malware analysis report

Static analysis result for SHA-256 36cfe9c63539145f…

MALICIOUS

PDF

84.3 KB Created: 2021-09-15 23:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e24d2aa2721da2b5942a3a386a6877f9 SHA-1: 5b1a0e708d4082ee1db5053b065f5367ca93caa7 SHA-256: 36cfe9c63539145f4cbe34c86fe5dd507ff494e429dccc008c584a385da90c38
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised content management systems or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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 https://medvor.ru/uplcv?utm_term=i+can+do+it+meaning+in+tamil PDF link annotation
    • http://autosoftware.company/autoresponders_images/files/12860170604.pdfIn PDF document text
    • http://erimti.com/userfiles/file/85940907060.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/74924373857.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/23331301733.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/xubebapoginixaxate.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/54541680620.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/kuvazovowo.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408b44c721d---96779157363.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/71277156453.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/92bd0593a0da93da743bebb8e4995e24/pewupesaxezawol.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/puvituriwa.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/pepixamopikimadefot.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/661833923.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210902105541538688.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/xulowijizemudemonogu.pdfIn PDF document text
    • http://pileki.com/imgup/file/96583413293.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/22546370719.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/0622b0b83427b15e0248af62a140dd7c/33106365578.pdfIn PDF document text
    • https://pontus-sd.eu/uploads/file/tifotabokusek.pdfIn PDF document text
    • https://raljob.com/userfiles/file/kepowakib.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/289870163.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/fadazipivuwoboxasul.pdfIn PDF document text
    • https://areicon.com/images/file/91539038446.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/72440958853.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1612f227f6568c---44797338137.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cfddbf2a4---55059037714.pdfIn PDF document text
    • http://xueyuan.zlyxgw.com/uploads/ckeditor/files/20210916021715.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/tezilutuwepalozabusaf.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E3 23160 bytes
SHA-256: 82cc6cf4510c1be8ac46183eb75e6599e0fb359b729a2b2a1e8914667533f5a4
font_01_sfnt_off0000fde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE3 10396 bytes
SHA-256: 4bea6e279c52e187157ce592a98c7435e2e0ac0849b1787332b2197e8432277e
font_02_sfnt_off00011525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11525 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4
font_03_sfnt_off00012ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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