Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e5c66abf733f65…

MALICIOUS

PDF

92.4 KB Created: 2021-09-01 11:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d3419b5a7ad43576f793909ff9894d64 SHA-1: 59a9edbb2f23d4e06fc6015418a5fae73d068b64 SHA-256: b1e5c66abf733f6579ea2615c8be55a80a767b8cde077a2a74bbaa88b634184c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=proud+mary+songwriter PDF link annotation
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a03581c6572---67683933100.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/56885010734.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/a4dpqnf719btc5s117fe9lv8n5/13820613704.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/tofowenileluxijalibil.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/16246479797.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d76c3588f---dezalufanesegipufixiwo.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/pavuvuxaka.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895d1671c42---12923626269.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c630f911211---8463005906.pdfIn PDF document text
    • http://goldmustang.com/files/files/83756103100.pdfIn PDF document text
    • http://gloria-eurex.com/rupasevizurejasepa.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/38720792222.pdfIn PDF document text
    • http://nsureunion.com/clients/71556/File/71398126938.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/8524a62d6df257606df0d050d6579ea3/67317023318.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/64350873118.pdfIn PDF document text
    • https://designclarf.it/file/vofixet.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806eff200ec---fuxenuzuvagi.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094d068b1900---19391701763.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/wabopades.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/76404038458.pdfIn PDF document text
    • http://shimoltd.ru/images/file/laguvedepixizedonelovi.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/88041801988.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/9d06709531fab4776958eff3f974ad9c/binosututawadop.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_off000100e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E0 19016 bytes
SHA-256: 71568098ef69ff1a1f7a91e7621940e3472cfe033624d4b8d5c980e85d82d113
font_01_sfnt_off00013243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13243 10844 bytes
SHA-256: 9a2fb6c64fa5f1d3e69b0fa71ce03bd4b63669736924c40b016e216ae7efdc59
font_02_sfnt_off00014b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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