Malicious PDF — malware analysis report

Static analysis result for SHA-256 431bf57a60fbdf81…

MALICIOUS

PDF

78.5 KB Created: 2021-08-16 00:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e678158e58c5e67b8977cf4a9ba904d8 SHA-1: 8b6e9b75bfb1d490218ab4051ef22720cc9c6a65 SHA-256: 431bf57a60fbdf81257922a808a87323e631a0b5cb793dc2f76ca6b7ca34d75a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable domains. The presence of multiple external URIs and link farms suggests an attempt to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://smidgel.ru/uplcv?utm_term=is+selling+calls+bullish+or+bearish PDF link annotation
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3ed7a7e99---musufoporefevaxezusalomo.pdfIn PDF document text
    • https://ghnservizi.com/file/11811073631.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/tasuxikobuzujomeb.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c97de3eabc3---34516578658.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/garurituvevifo.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/watirepi.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/gumozuzulexovabo.pdfIn PDF document text
    • https://bataretak.com/img/files/file/kadegokuxusafujezefowiru.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/tabumebebiwulatu.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/9l2q6qph109h0ittnlbd78bdqg/kidafudumarum.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/vujazododevaxazonarom.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/da9d796a8d5910656c48ed3382212443/73416556973.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/53502936642.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100c91f4a4ff---perere.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/fodinemijodejogif.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/zusepunuxut.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/kibaritijiluzotesolajo.pdfIn PDF document text
    • https://asi-filter.pl/files/file/pusesivevulapat.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160725e1b21e7a---69162498318.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e65f7cbea88---pafuwu.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f945bbd78---zedutazenuregibezogo.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/79069270536.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/3771297bd046bce858d7b04acb7a6693/47246919817.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_off0000d34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 15924 bytes
SHA-256: 8d7e6cb376d3d8127e8f93edf06a176d8be967587b6211f67eb1f2a0b9e9c12f
font_02_sfnt_off0001145f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145F 10604 bytes
SHA-256: 64c3f3a3b6dad00d04f2c04035db78418632b9b29dbdf1dacee2731b9f713b44

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