Malicious PDF — malware analysis report

Static analysis result for SHA-256 df976d573ea80616…

MALICIOUS

PDF

84.7 KB Created: 2021-06-30 12:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 43e11cdb7925453998ba6aa60909fc89 SHA-1: bdc455bf4824486396b4080da237a84831e7db40 SHA-256: df976d573ea80616868a3cdc57a6b2a0318d980e7ffe2e573e3048b0f96437f1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://bluza-shop.ru/content/File/68173787813.pdf In PDF document text
    • http://m2m2design.com/userfiles/60017594594.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769594be90e---27257543064.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/5b516fb1317ff6e59aebc041c51d24e2/26102827316.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/tupaki.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/53736736045.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/85019259950.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/19155036318.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d57fe8a10b---14930641725.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc8cd07240---bubesijibibefe.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/5730dcbea4e32bf6a153bcf4bf46908c/toforabelewugogogu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/q3lnn2nnncpoe0kfr7p26p2d16/kagera.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/37976548836.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/73076358116.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd987bff78---kojisiwutipijatok.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/lfrkd25fg0jvef6rok5enuf0f7/vuviw.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/d59efc0efca66e89f60491748aac4768/80795639549.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/bogexinomilapekoj.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/93a30092290819a2df4247201219cb10/4740483852.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091c12bd3f90---xemotezotivetizu.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088da6429583---91906292563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=clash+of+clans+th11+war+attacksPDF link annotation
    • https://mediaget.com/userfiles/files/17487484633.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B9 18956 bytes
SHA-256: ff5f1e58c3767e0f4c31e67055bbbc07c7a919f0cbf9eccb0015bcbcffc4bd13
font_01_sfnt_off000115d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE8 10472 bytes
SHA-256: b2b201396857b82e8250c518cf533fab526b8927e7cbf79970001440d8b2d6eb

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