Malicious PDF — malware analysis report

Static analysis result for SHA-256 fecf12d08790424c…

MALICIOUS

PDF

82.7 KB Created: 2021-09-14 21:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 11a13841b00c56776f99214803de8610 SHA-1: edb05f23d288d7caf84c31c8b2e10cd1870d90dd SHA-256: fecf12d08790424c506f92bd454c22f7db55455d5ca2868ce253f5fdec503d13
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=exploring+the+hospitality+industry+walker+pdf PDF link annotation
    • http://cokhiminhhien.com/media/ftp/file/51494949087.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210910191733.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/muxamusumomozanit.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210908200713.pdfIn PDF document text
    • https://endobible.com/userfiles/file/sotofutimulev.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/xozisavidimiv.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140cd0f4b12b---tibupujuvelixunatima.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613177dbb285b---laxofujalorakurogafawese.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f59d3e041c2c6478bdf2136f5f0b0061/44824854726.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/xunodekur.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/a56e00ab225de90f3ae79b9061a9756a/50342192328.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/70157843075.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/54371916648.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/kekazuwopofoxekoxadobu.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/mategum.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161365b9d0f8d5---nanowowuluta.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/9414777497.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/0e6c9bfdd212a9cc803e3dd74686943c/fulilekuvu.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/51727277522.pdfIn PDF document text
    • https://rippa.pt/files/file/vopafejeruguwi.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/fukubilawawejomawuxuxof.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/18794409684.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/13165331870.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_off0000dd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2D 17460 bytes
SHA-256: 184ab7b2e5a8775ced12bd5a0f188924a763230656c5cd8e3c4bf820458efa34
font_01_sfnt_off00010a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A83 11256 bytes
SHA-256: 673d4e174e0785c1864126205238b4c49a9fe06237219333178f45581ab59921
font_02_sfnt_off000124c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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