Malicious PDF — malware analysis report

Static analysis result for SHA-256 0921997766daa4dc…

MALICIOUS

PDF

78.4 KB Created: 2021-09-06 05:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c0777ca73efcad43d81f670c29d47cce SHA-1: 41ee343d8f019b9dea4488862610ef06007b83b7 SHA-256: 0921997766daa4dc45825670ffc69d620f9212a5cb0f01f6ffe5258f9c509749
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish for information. The presence of external URI links and the overall structure indicate an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e52469af88b---51906551286.pdf In PDF document text
    • https://efnnma.org/files/file/45472996399.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/d13ecda13fc542584d6b3d40b851e8d3/gajezebudukebef.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/83898525773.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/61527325356.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afe879ab498---zuwopisuvapafedosewezexux.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/53qfo8gphbd4qvapanl2e72kh4/dudos.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/faa9548909ebf230a1f38b0ca7582473/dobirevewedewe.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1ecf0112a---11104985692.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/61141634342.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/65079150014.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/30015566441.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/7852461310.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/53349685664.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/tinodedot.pdfIn PDF document text
    • http://carszana.com/image/upload/File/25534329.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/56a065047952c66ef6d95ed4b0efab8b/73028305891.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776fe2f3901---77672100991.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc03233ed4---72908318259.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/kijofipos.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/70917395460.pdfIn PDF document text
    • https://palet-school.com/files/files/67114319921.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/c747b405adba1fe12f276c3059bafb11/43452542664.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/76527978032.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb75432f3e---divetutofoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=saxon+math+course+3+free+pdfPDF 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_off0000cca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BB 11196 bytes
SHA-256: e48e6a6ba68987bfda2f3abce2b523d1248aec2e0d991765fb27372dcce2135b
font_02_sfnt_off0000fec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC7 17332 bytes
SHA-256: 3d9f629910e42e67723706075a7ecd286801740daa06955e9d5d71b4db92eaf0

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