Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d6c73a7ef8fa146…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 11:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e1eb88cbf126937e4ee8529362ffc38f SHA-1: 44f5aa351dc23170a764191660369ccda3d23b26 SHA-256: 9d6c73a7ef8fa1464c47c2aab9858c584af1751e4ba60bd8be05e425819c918b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking direct user-facing text but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=mathematical+statistics+with+applications+in+r+pdf PDF link annotation
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/v1te0gommnici4asvlqbjvoc3e/pugosoxibusaxat.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/59881803025.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/71639911187.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/nikukexofapud.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/8914260984.pdfIn PDF document text
    • http://minhanh.com/files/74167572624.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/zurijifirabokoxoxetobo.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/gewavalig.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/33052832053.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/16852191438.pdfIn PDF document text
    • http://acril.ru/ufiles/files/24059897142.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f85762fd1a---simawalabugadetonakederal.pdfIn PDF document text
    • http://capital96.com/userfiles/file/56807148150.pdfIn PDF document text
    • http://eventaipei.com/upload/files/31586549293.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/ad0455d902c8a70271c9ba4ec08f0031/gimax.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/wiwunuludagoro.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/jplrm7muvpcssu9c3qgor0n4l2/dopiwowakijewij.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36ce7ccc7f---97901290735.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097e3c2d1d9d---zizujojilazuzamosukesil.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/55078821628.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/54335816304.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/50714466307.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/5cdfb9ac34ff2e06e69a4cfcf4fb0108/63173744024.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_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 18004 bytes
SHA-256: 65a9240cd50fc1fe9ea945f98ac380ab3f6834dd6d56c17af46d51ec8e39354a
font_01_sfnt_off000109ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EC 10964 bytes
SHA-256: 300a2e82e191f725f526ec1a3b90bbc4165241b06c3a70a8038fd62db2a23bbb
font_02_sfnt_off0001233c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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