Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58a74f24ac98075…

MALICIOUS

PDF

72.4 KB Created: 2021-09-03 03:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f7e07c960208c3a4fb966df7a197cb1e SHA-1: e80184ee21bf45dd18643b99ef2fcc1e738bb8fc SHA-256: c58a74f24ac98075563ad161fed5adcbe7307ec52c455bd7c6f6eddb5331734e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. Although no scripts were extracted, the embedded URLs are the primary indicators of malicious activity, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/hn2up03td0md5k3jab74tdrk5g/71183737377.pdf In PDF document text
    • http://ehoron21.mn/uploads/files/95986663764.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/85938719181.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/mumizudulekufobowug.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fb311b13e---56181060894.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/topavuzutanof.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/18079749510.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/77d26afcaeea6963af66d2a8d4a0e7f9/tofatimanizajawadisugone.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/80262466295.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/8e037f789c1c97404685b66a0dc56116/24263823949.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/dikagalatig.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/dumoxalirof.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/72617567003.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pagujinuvodulirevepuxum.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/nusapuzuvafapolesov.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/77600129796.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/d2294dc6cdbc8460a5f128a29685d8b2/xinoda.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c2babe62ac2---86096891802.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/pajole.pdfIn PDF document text
    • https://kuepancong.com/contents//files/robemovoxu.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/gomajozeje.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/daxufisijinux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=financial+accounting+cycle+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_off0000ba7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28C 16208 bytes
SHA-256: 57183e161ec359f012782e4a5338887391817cfc38d5cf11993dbd32a1dc7c71
font_02_sfnt_off0000fbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB2 10716 bytes
SHA-256: d141b27ce4168911b46b258fdb1a7e4be522e8504a0012ec1e3f181d2af05ed8

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