Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce00b3dd3370317…

MALICIOUS

PDF

82.1 KB Created: 2021-09-22 18:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a16715e8a3296f778b16d6bdc634d0f6 SHA-1: cea7970a445002572318e4a66f8b5b9f575813f9 SHA-256: dce00b3dd33703174965560d13593619102b5503ff2fd20ae1aa80def93907fc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of embedded URLs, many of which point to disposable hosting or compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=how+do+i+find+my+password+for+wifi+on+my+phone PDF link annotation
    • http://buyyoutubelikes.com/ci/userfiles/files/44871823561.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/zulatizajerimijewujotum.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/kamanuboxetov.pdfIn PDF document text
    • http://glassick.com/userfiles/file/4351758426.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/magizorexosavegiti.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/zozubewixazalilif.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/hnv9hhai8468lbjg8j1nhmtchn/95790456023.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/berujuda.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/90945719908.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/64663471473.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139aac57a9e5---kuduzejololalejinadex.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/pifibajeraxenopozufovaju.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/55564744054.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/27653091286.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/sedetamezag.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/9534524907.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/reseg.pdfIn PDF document text
    • https://mihalex.by/files/files/68763019826.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/mejifatibenaxutijirogi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614639ab73e27---govudejopemoxararive.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/walosevepaxugoni.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/sapote.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/60243146711.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_off0000dc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF447 10808 bytes
SHA-256: 4e354b46a945101c69e7a364a0ef88def176a39b65653a9530c501de805c97b4
font_02_sfnt_off00010d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D01 17860 bytes
SHA-256: 9f988101f0d0801376f89e502a9ddd1f4bd10fa6762f4a9f173b433c9c9ab5f0

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