Malicious PDF — malware analysis report

Static analysis result for SHA-256 641307dfeb4f8f62…

MALICIOUS

PDF

87.2 KB Created: 2021-10-05 06:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4492cfc4a27a58c94fee8af936d47fbd SHA-1: ff8ff9704d59eecc1de9f47a9fcfdde2f9f931e0 SHA-256: 641307dfeb4f8f62490144687c7133720f4862f8ce7a1eb10839a2e6accad727
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports its role as a lure or phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=carry+forward+subtraction PDF link annotation
    • https://majubesar.org/contents/files/wazuri.pdfIn PDF document text
    • https://fq.ua/images/file/sejopugokimozagana.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/xukuwuxerulilomafomeliba.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/tejimesisonabowevekeja.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/mudiloxokupajejepajuvubi.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17096006917.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///87395813479.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/7rstk2g3of0jk1seoirbm1ol0g/vovabelafabegakibegutaxe.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/93277592283.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136785e68f9b---ranakum.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109170816523332.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/58436988591.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/dofirutamanelam.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/86492962480.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/divunasezekolag.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/pomisifedizuratagavoduger.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/90518274458.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67d2a874b140ac51977d57d80722aced/75441969906.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/1082336170.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/56491271491.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/vamaxagizebeporogaladi.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210923044552.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/6365962600.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/a5cc208c3c5df2156f31799a2d709768/27953346792.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_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 20096 bytes
SHA-256: ec7c777ad0354c57ed44e77ff1bbba8b945f491d3567ac3a1758222216c39a42
font_01_sfnt_off00011e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E26 10760 bytes
SHA-256: 80530ae8d7f47110c1ca1654f2c1edd688edb1a91af890637c9e7b1625f67e40
font_02_sfnt_off00013725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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