Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8f3c9199b0970c…

MALICIOUS

PDF

86.3 KB Created: 2021-09-06 00:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c9de0cb2449d5613df1d4c9fe830a384 SHA-1: 23c95d26b1a2c5da6771bc2ec8a72dd78eb03d77 SHA-256: fc8f3c9199b0970c2f78169f27b3a956c3f080e19883ca9eff1f7533b65fdd63
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. Heuristics indicate these links are used for SEO manipulation or to distribute malicious content. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely serving as a lure to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://mazurubezpieczenia.pl/zdjecia/fck/file/sawaloruxojorigiv.pdf In PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/muzin.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/depigalovijizagife.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/jupur.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/95940534180.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/47368658644.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a86f4dcab2---59957756673.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/wugakadorola.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/29865438591.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/oa2a87f55ral7vo23tgj8kh9u5/sojenetatipuxetireki.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/37223268285.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c67dadc5871---gitedepizasagakorezamoxed.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/941f6438ehbcnf3ltk0viujljh/48509992204.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4f6b1f664---bimubetifofilavimuxavajo.pdfIn PDF document text
    • http://0930actress.com/files/files/xovupelibulilom.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/l1p3fpvbk4v3c3h99c6lnepnj6/xujosudetixogekebaga.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ecf4af162---wimofubidujaguwa.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/cqjr57r1sa6eotc55g4u16kmst/75102075516.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/09pdk9alqbi8pk86sp92dnunu0/63627084954.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/newasexulusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=introduction+to+information+systems+16th+edition+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_off0000ea6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6D 11224 bytes
SHA-256: 328dfbc419d284f49b5599d3283979d8cf83c2ea792eb291c7554e070e99622d
font_01_sfnt_off0001049e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049E 17948 bytes
SHA-256: 5a62650b69e83e9e2a52dda36906683a8d010c2f33698319cf2c5d95e99ffc59
font_02_sfnt_off0001331a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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