Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c59c8beb4b18de…

MALICIOUS

PDF

98.2 KB Created: 2021-06-30 06:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d4f28606c7067e6fbcfe94952a25a5dd SHA-1: 60721d15b6b3796016c91758e9afe29c82f5ae85 SHA-256: 90c59c8beb4b18de701c89f9d81147e1122d9664cf027f1e541f33f3c620291a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://oniceh.ru/uplcv?utm_term=48+laws+of+power+law+list PDF link annotation
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609498773a1c7---wetugajudajebufeloden.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160adbbb7c4eb3---39860223551.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/basamojodunuvo.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/9195b3fad3110120068064655e604a0b/fujaregoseki.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1e6728aeb---palibatanibiji.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/36vemohu1c66qteuejafla4du1/14631502595.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7c87bf46aa474681e5cc8723276fc3e8/zexovonexuj.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/61125463703.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb0126c27c---31710786448.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e91a4dbad7---xorexumibosorezozo.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608537fd1f219---52572041528.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/xezakufurozabusojobaliw.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c32c9eaa6---xogezovejozegujim.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/5686723152.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/0730e0a95761e83c801043c3d888886f/risuxudifibipalugow.pdfIn PDF document text
    • https://altbuket.ru/files/jujisinerezasegejolewula.pdfIn PDF document text
    • https://securitydm.com/slicice/file/76535659006.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9426c7bf6---23789882032.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/3bf8c968a06734dbafb1e708b7a69e90/neforemimebos.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/16175075813.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12034 16976 bytes
SHA-256: f4ee8543e7091ff9808b2fa1d4ac49542db7e9a6f3fb7a289b78b003687989f4
font_01_sfnt_off00014c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C39 10520 bytes
SHA-256: fcad0fd0d209b1114fbeff95756b408283ca8eeac1c6e18cd57ff4c45d8a7cdf
font_02_sfnt_off0001646c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1646C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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