Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1f284f9ccd0c4f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 11:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 936b66bc9b3d65f2ea827e17de975636 SHA-1: 2fcdc0ac177084bab8968a6706fc3ab5a76d2a66 SHA-256: 8c1f284f9ccd0c4f15a375596aab2d61f9b7fecbeb8cbef60937f74bea7f1083
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised CMS platforms or disposable domains. While no scripts were explicitly extracted, the nature of the link farm suggests it is intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pixomot.ru/uplcv?utm_term=economia+samuelson+nordhaus+pdf+italiano PDF link annotation
    • http://chongros.com/userData/board/file/noxuwapokaz.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/vutarefife.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/25524015295.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afb70203832---29068518334.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6f868ea2e---59912523375.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc73a86bfca---xakimevexopibizavunifudud.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/7f5f9eff3e97c1a8adf06e295e28f6dc/52271485486.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae74b3a392---26687534740.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/10688605510.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/28677245466.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/11928637937.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/fb9e2b652bd25e03bb660dc754661aba/davovavodaxeg.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/48573952538.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/zavadiwipotiri.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/60486712985.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/66717930637.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea1fc7222e---44381360149.pdfIn PDF document text
    • http://d4scanada.com/clients/8/81/81a8d3ecf29e0a7d9042e8364394d873/File/bafurulabubuleforikag.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/9a872a4af7501d8011425461a65bfa0a/77813570865.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/veluvelomodajiresatube.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079a521c099f---podepiturifumujo.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/ef188f575f34e7f5b1ca0e9ce13be3d0/51955919453.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_off0000d5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDB 18908 bytes
SHA-256: 57617d53ecc9ee30c168d1a4bfad9046c0f111b1f21d5c5a0065f30f5a41db12
font_02_sfnt_off00011f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F31 10968 bytes
SHA-256: 063de211483ca9a603483ef5664bcbb74306874bc8b63a681792ba836ee2bfe6

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