Malicious PDF — malware analysis report

Static analysis result for SHA-256 97e5934dc641cb2e…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 02:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 818e9fe978da749a76a3a6ab14f3c610 SHA-1: 6616fb7bce407a6c054633357d3a9d3af0ac6447 SHA-256: 97e5934dc641cb2e885dd3e308e942cf4cd6e901d496740644754df09f06c191
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting domains. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://smidgel.ru/uplcv?utm_term=android+transparent+navigation+bar PDF link annotation
    • http://prompol.com/media/file/zewitoxedekiv.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/59770080966.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210913004717.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/89878899526.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613df830dd167---torajutodagukekuvafuxaven.pdfIn PDF document text
    • http://dakmet.pl/upload/kuxipejazonef.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/rufedawitami.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/jimemegizubepofe.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/banazonuj.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/22065389627.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/98563835171.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/kumenopamomovawez.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/77853292494.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/66600497002.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a36add3b7---7811120316.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa83f3ea62---widipevowopaj.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/nivurubaxofu.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/37344550690.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/53586388745.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/kagawizud.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/24925726341.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/xofimenumawelereg.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/60927541111.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/49245692256.pdfIn PDF document text
    • https://lapdonline.org/file/gogevuninaxeraxev.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_off0000d913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD913 18944 bytes
SHA-256: 0d127b849e60ef408643384dc43780cf3b9709ee01d8890071154a348067e1f7
font_01_sfnt_off00010ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC3 10708 bytes
SHA-256: 2a102492b90466a828b688fa2725807b55755565ee2c4c65c999fc08838f2085
font_02_sfnt_off00012312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12312 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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