Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1d3ffe583e7612…

MALICIOUS

PDF

83.7 KB Created: 2021-09-10 05:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a54bfdeb59ec19d9780a37a7977f4c5a SHA-1: 3c6bd52fb92ab556910ca097dc8e1776d715d53b SHA-256: ce1d3ffe583e7612712bd3ae69b533f48cd6405b634abda3d5f84018d16544fd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The file's structure and URL patterns are consistent with a phishing or malware distribution campaign.

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://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6f31800cffe46588d864c19d4a0017d1/wanevukidibefejepawuwure.pdf In PDF document text
    • http://curvesncontours.com/userfiles/file/559362786.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/22021758857.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/36399911155.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/478472afe6844cd88eb20c3651a2c4b9/53686320488.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/51626282620.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/zunaredelomudebu.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/da969c703ab412608b4b33724d7cfaa2/xowugikigikepoxixip.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/sofamezesotusafebukas.pdfIn PDF document text
    • https://stotex.rs/files/rumiwa.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/c0b0f843200707d9d258637e4389c12f/vivajaxebajatabixugaxugab.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/pomujuwa.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/wudutikutuxevejumupulenin.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/45604384467.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131551780778---19581866365.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/41237585547.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/kepubeti.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/dosidaderajivusogex.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/80201117410.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/xoxejura.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109020608135613.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/temopebikudewoxod.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/bemesatuluripoge.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/90213929301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=gif+for+wallpaper+androidPDF link annotation
    • 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_off0000e33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33B 10352 bytes
SHA-256: c80609a3b25056fc9484696321a9cbc5f119046ad7c107a01e1f32a1b404734c
font_01_sfnt_off0000faba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABA 18104 bytes
SHA-256: 51da63d7d175a15623a738762fe7e8e680550c876b38637470438a25b81d6d5f
font_02_sfnt_off00012920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12920 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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