Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9f81bceb08f7be…

MALICIOUS

PDF

84.1 KB Created: 2021-09-15 23:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 130e9ddae797270f07450f43d6691ca1 SHA-1: 85a12f3c779f1f514e15dad929333072bef59968 SHA-256: 1d9f81bceb08f7be91aa6acee22ab26b176a30f4bdd4a0f7f1f25ab0fcd40418
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading malware. The presence of external URIs and a link farm on disposable hosting strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://krisoc.ru/uplcv?utm_term=download+unkilled+mod+apk PDF link annotation
    • http://t-p-fortune.com/userfiles/file/52995399571.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/8ceed057d812a52106f7e18c808aba24/80798301304.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/xudivunufotigufawot.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/munipafi.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/nomujakiwulokepebiw.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/zasaseninar.pdfIn PDF document text
    • http://proart.by/media/file/25619871899.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/8b4d816606941e1bf9eafbe135a14735/tunikubori.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/jigedajijiwoli.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/kelodovoxisezutuzadiwuveg.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/luduw.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/39744305022.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/rubewesuni.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/74077611739.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/doxilitojejaxot.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210911_ABA4FA1A3E28676A.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/gilafibesovivada.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/6blha988vghup1biqns8vev653/36937738159.pdfIn PDF document text
    • http://selidbe-beograd.info/files/jipusejojunusegavoku.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/56122378145.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/panavek.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/nikezetokawa.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/71507315398.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/g68g7fo2er3qiu1mff73bioaoj/xovepetomoxusuzixodalo.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_off0000e693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE693 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAA 10464 bytes
SHA-256: 67c6facda089ebbc90cd23a655e52d8c93e0cc6671aed50233b7d08f95e72d15
font_02_sfnt_off0001165d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165D 17324 bytes
SHA-256: c367a0661037ab36cff7aaa01c476778f570d46918b44846793d4f1b5dd6c6bf

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