Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e7e1877691c9bf…

MALICIOUS

PDF

75.5 KB Created: 2021-09-05 10:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3842d19315b56e3ee40b11543cca1d82 SHA-1: 18289210d3c9fc7d7822376fc4b521155eae47be SHA-256: 65e7e1877691c9bf4783621fe07e2534d3a8654a2c656b5afe94dc8e849329d6
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure suggests it functions as a link farm to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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 http://bulgankhangai.mn/userfiles/files/8095816097.pdf In PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/6620a1978fae1308bdbff446d7409f18/xasijoximirefanakatawa.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/e7beb977095a00287ae8bce7a6f19a25/najegutidenewerezudid.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/161029f67b45b5---lorevasigugegotiwonawi.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad993445672---duguxaxipodiroxovajewufer.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/3348782176.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/gituwi.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/4457a830731d93282beabb311475f017/61344724086.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/xunaxevonozitutemaxup.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/f5a3ea6fa3e39171d29148ab0ee406b4/81862858294.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/26018389673.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/51601107080.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/vubofinejezokovupawivufe.pdfIn PDF document text
    • http://alkanboya.com/files/file///51020755129.pdfIn PDF document text
    • http://quaint-house.com/pekiwesasowoxir.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/ketasiribusalikagurej.pdfIn PDF document text
    • https://paulins.se/anvandarbilder/178/files/50843908549.pdfIn PDF document text
    • http://short-story.ru/upload/file/rurimusegexogolew.pdfIn PDF document text
    • http://ccsl.asia/files/89156016027.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/bukop.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fde71c831f---weberokirivapesufilap.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607738793b226---zoponega.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c408f2c898---rafazilivu.pdfIn PDF document text
    • http://lg-palette.com/upload/files/67122000031.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/90450137506.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/xelojufegotezu.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/11826984813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=combiron+f%C3%B3lico+bula+pdfPDF 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_off0000c00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00C 10792 bytes
SHA-256: 7f2c29f4aa191ec98957b835d14f2fc536df0f0f73099eb62ab2f95e5d13800e
font_01_sfnt_off0000d84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84D 17836 bytes
SHA-256: 37010dd518d39ba571911512463c394213c62374738a0c76c19ff8eb77b4fef6
font_02_sfnt_off00010685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10685 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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