Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc761cb2e16c3099…

MALICIOUS

PDF

67.8 KB Created: 2021-09-18 01:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f26a73faa4bfe2cf14e3bd8a669a16da SHA-1: 214b3224447171525be3d713818ac17974b807cc SHA-256: cc761cb2e16c3099721e9b3ae3006ff1e76a945fd0ff8bf4a7f9b1a8a54b5891
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs that form a link farm, with many pointing to disposable hosting or compromised WordPress sites. The ML classifier also indicated a high probability of maliciousness. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to lure users to external sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8341

Heuristics 5

  • 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
  • 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://ketchas.ru/uplcv?utm_term=mmorpg+io+games PDF link annotation
    • http://syntrend.critical.tw/upload/files/wegodunu.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/2231756364.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/domofezaso.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ca650e5a7---jasunebetavamisaze.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/75313605984.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/fovuneraj.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/xudisilakixusamor.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/13822255061.pdfIn PDF document text
    • http://gespk.com/userfiles/file/24819302538.pdfIn PDF document text
    • http://mfcpavpos.ru/file/kekufifijeraxixo.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/20378847994.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/14443842079.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/3930021309.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/8af7dc4b5c25885811215650f5b6a44e/gezugawi.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/wonetuzumovod.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/xaluwit.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/78304023167.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/26542355085.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/jixatizogikebekorir.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135344a983e1---92631451453.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/25605632576.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/20118984346145109cd9a2e.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/kojobejavasoru.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/6fdd29027559aeded5652218d2fc49c7/xuxazolibulavazamufa.pdfIn PDF document text
    • http://huntland.hu/upload/file/vomupuribotisusuvos.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE943 10340 bytes
SHA-256: 7eb491f86deb99ac93c119c01f0734baf7621ec940491c02ff4ae96ba7c89ce6

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