Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93892a0e63dbde8…

MALICIOUS

PDF

67.8 KB Created: 2021-09-24 13:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1b5adff3fe35082b2616cd7daca8d44f SHA-1: a89ebf9ef6a37ab550c006a52e4c348efc858280 SHA-256: a93892a0e63dbde81551459d2f455c6bfb31f518db0992d3c132c2cc3d3af4b4
156 Risk Score

Malware Insights

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

This PDF was flagged by a malicious ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/24940092360.pdf In PDF document text
    • http://phukhoabacninh.com/images/files/ralolilakit.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/vugapiw.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613fef0daa0fa---12892342465.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/41179454211.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/42150684108.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/25412683739.pdfIn PDF document text
    • https://fond.ru/userfiles/file/xegumoriranisuvez.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/lamanevarakilopes.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/11503141881.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/28969657544.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/93041996826.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/vufabin.pdfIn PDF document text
    • http://hoachattn.com/image/files/72645125003.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/9511449225.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/bararuwexepiruwifi.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/lijowawijorigonuxusok.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210920205952.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148df7e4a5a1---liralawabomizirerile.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/24/75089245559.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/a95158edc5a973e20cd244c0cee8bf5a/situjosewuvaxog.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/zuwolixabepoleforumubi.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161411610b8c0f---14023712107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=windows+11+and+android+appsPDF 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_off0000ae93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE93 10240 bytes
SHA-256: d84ccfa6e46d460937fb7444e8724d0e80e250577f766378ba61198a1fd461b0
font_01_sfnt_off0000c5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B8 14476 bytes
SHA-256: 7ed23ea30568ce33c06338706efd5a358c24d52b8573c201567bfdcdcc213cf3
font_02_sfnt_off0000e9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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