Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62ddeef658c9835…

MALICIOUS

PDF

95.6 KB Created: 2021-09-19 03:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 43eaa2d0587102e0499eba938961b213 SHA-1: b69a0ff79bfd683113b978133e5242bb3cb0cbdc SHA-256: d62ddeef658c98359022627c123b98603e269289cd5cf8b20858cc19ff31e13a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=best+offline+games+for+android+2020+high+graphics PDF link annotation
    • http://huarui-bio.com/upload/files/jodaguniwok.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/fususevonokifepekelewe.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/tutoritusa.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/pobupafufadebabozu.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/dowopafeveduzajupumeboko.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/debasosotawarupenikeri.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/dekawufawepet.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/sasipidujituxasi.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109172021294977.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/tolemizalagasadula.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/duwopajumarame.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161421aded4a7e---19783209140.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/moxogexag.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/5646601398.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/00d6957b97dbecba42dd9383ddee9756/64020107644.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/lalojoloveguwefakowexi.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/55385021326.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/kulevapakekajirotip.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/81665421805.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/74955346569.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/71683261605.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/tisaderim.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145a052476dd---zowele.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/zatokagalu.pdfIn PDF document text
    • http://health-bridge.in/upload/file/28260379160.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_off00011027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11027 11360 bytes
SHA-256: 2bd204628e516e72552a3edc3eda62244d982909b128c87ec50baf2ef03dcf72
font_01_sfnt_off00012a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A90 17388 bytes
SHA-256: 50d615aef4ddc840afba99b0981835f200c79a0d1e078f3b1e1b0daca5b8a1c7
font_02_sfnt_off000157da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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