Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe774e6a26545b0…

MALICIOUS

PDF

83.0 KB Created: 2021-09-21 06:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8b95fba2403af638fb9a4db675705aa6 SHA-1: f23cff1db8696493d842847eda6f6a655d002802 SHA-256: bfe774e6a26545b0a2721f18cb7d15fa3872fd8b69fc015fda7a5a0f61bbb9ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, characteristic of a link farm used to distribute malicious content or conduct phishing. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect the user to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=mass+effect+android+games PDF link annotation
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458c5fb5b23---39879754724.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/jiserisigasiriju.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/nimogulipusamudere.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/zalerunopo.pdfIn PDF document text
    • https://stauber.lt/images/files/siwasi.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/zafokivepakuxofa.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/66747617318.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613282281dd30---xagoxubewikufamitig.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/texowewojazum.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/kevavopefidikezo.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/nopusigazibozowagom.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/gekon.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613134c6e5611---5020010216.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/14237320129.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/87447149126.pdfIn PDF document text
    • http://tianfonmm.com/d/files/bijivupifuwi.pdfIn PDF document text
    • http://cheapstandard.com/uploads/files/28117885554.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/12562222559.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/2046242747.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/wejoxijavim.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/4ofpivham265aor5ddtsig28ou/vilexutodewutoteka.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16141684774497---rotifajamiminovixazejapaw.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/46387795470.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/19183239567.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/wavoxolifexibet.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_off0000e091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE091 10768 bytes
SHA-256: 8efd856d62343566cb4f8246f00d47710993b5d0c6f28ee6e01030c8cf35269c
font_01_sfnt_off0000f91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 17168 bytes
SHA-256: 7012a26f463a2bcc475bced0748fd55be43e7cdbdb6625d95527ac2b2b70d341
font_02_sfnt_off000125b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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