Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf2ff466327103e…

MALICIOUS

PDF

90.0 KB Created: 2021-07-19 06:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f4967d008908d431245302a3b69bdaf7 SHA-1: ef8b94e201561cdede77136d3765a0d072f17b10 SHA-256: 2cf2ff466327103ebe7bda0a26c59708c834edd6484910857def627fb657e0e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links. No scripts were extracted, but the nature of the links and the detection suggest it's part of a phishing campaign or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://csc0311.com/userfiles/file/20210624100407_ogcka9.pdf In PDF document text
    • http://uhy-th.com/image/upload/files/68416199724.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/39388490851.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vihqh9hqg90t9uoquns3j18gm3/setaxosewesidoloj.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bddc2f8af01---jerinirikodo.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/fusudoxenakuw.pdfIn PDF document text
    • https://codecs.roimages/file/nenedewovew.pdfIn PDF document text
    • http://proxima-design.cz/files/file/wipixeziziwobovevuja.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/ee000a0e8acae8ee7561232afaba7055/34998339655.pdfIn PDF document text
    • https://edusfera.pl/upload/file/rarusaxixajusoli.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/68845789727.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2102c682b---24139712983.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/2c66c3828fbaec81868dae7c024e07c8/31139191897.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/tatewuwibexojawol.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/nofuzidemugunimu.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a182994b8d7---luzakevimefazipo.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bba97289c33---4720603015.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/35939661804.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5b5902799---bifanugesinirijerasavu.pdfIn PDF document text
    • https://kristinanamaste.eu/files/linetibazalag.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/c0cc1833fd07166147680ebce6959c27/1655706157.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/lexoxurupobu.pdfIn PDF document text
    • http://iwishop.hu/file/86613838143.pdfIn PDF document text
    • http://jghsclass75.com/clients/f/f3/f322050927ea28328664fd088939ffaa/File/defetop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=fifty+shades+book+pdfPDF link annotation
    • 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_off0000fbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D9 10668 bytes
SHA-256: 78f1b7b69715ffcb98ac7fbb38e9a4998c911dd61c5e581a0051deb29342bd5c
font_02_sfnt_off00012c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2C 17912 bytes
SHA-256: b57884f8a2c301bfddf089285d6193fd82c83dbfd2358a558a9eaa3af034ba8a

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