Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d494be767822d1d…

MALICIOUS

PDF

75.0 KB Created: 2021-09-21 13:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2725db54637184a455fd52310808b0a0 SHA-1: 4e0f44840990107691df27fa391566baf9d188d5 SHA-256: 9d494be767822d1d6a1953925a751d095a4c337e7a83dbea3f7c22d8e6925f53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=live+football+android+tv PDF link annotation
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efc6013ab4---73738643550.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/74208815887.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/disewizenoxozifaxamu.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/wurigegesunewajeno.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/zawekisi.pdfIn PDF document text
    • https://jensbrode.de/files/file/bigolosijexutupazuwura.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/37125476885.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/xetagazakuvoxazerekipat.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/88247101961.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139b3ab821c2---9063742483.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210919181010.pdfIn PDF document text
    • https://greenways.at/userfiles/file/renuz.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109210237279294.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8926cb021---24126995947.pdfIn PDF document text
    • http://vswet.ru/f/39468381851.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/teworemojedopumubesekeved.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/waxiwozevobadojas.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/31321403946.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/19985161964.pdfIn PDF document text
    • http://home-plast.ru/foto/files/88676495642.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/jobovikofuj.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/rekanifopokebemeduva.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/92104483024.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/wesogovoreduwipuv.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_off0000c4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D7 10340 bytes
SHA-256: 33a9af9d7161cc0b9d75feed674f91f5885767212cf434a7c854c7b88ff7fe73
font_01_sfnt_off0000dc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC41 16364 bytes
SHA-256: e79ca083b4413446f2bd475a9ea59a83e8d6c082ff6d6c10aa0942d3106f7580
font_02_sfnt_off0001065c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1