Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff03d29304776fd…

MALICIOUS

PDF

80.0 KB Created: 2021-07-14 02:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: e4c267156b3f4a503e7cff962033e8f6 SHA-1: 63bc14c727b33b7f24a2e40ab180f32332534cd8 SHA-256: 6ff03d29304776fd78e495ea21dcbffbb307415c4972872a77c7f0967bda25a5
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV heuristic strongly indicate maliciousness, consistent with a phishing or malware distribution scheme. The document body is unreadable, but the link farm structure and compromised hosting are sufficient indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c01648c50d6---29964537788.pdf In PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082a33097d62---31031679783.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/70873142016.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///kavejozenatokelum.pdfIn PDF document text
    • https://t2sc.me/userfiles/zabumuz.pdfIn PDF document text
    • http://teraval.cz/res/file/manunevo.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c2d9f3e77---serosofavunupuj.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162321456821.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/1cf8db387d1d3cc8fde3b822e6d2489b/97040142279.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/72761366357.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a435a63cdbb---56929088599.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/79816448479.pdfIn PDF document text
    • http://promador.pl/userfiles/file/katabifapupukoxuju.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/7e8d556aa8c5251dd491b09e1fcb25a5/jatukidiguzamibimaf.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/pe4lk678astl93gbklg9v61ici/gadawujogudu.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/bituzumewew.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/suvir.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/68ltiaikmo179hkt9n819srgvh/43049074125.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/35606177178.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9d27cc274---7394748399.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/fbbce51d5b194b70a00b946f53a34a58/17624786611.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfd47b0857---pufawegujojegepalo.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/fixomajiponujowawiwuguda.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/88935087073.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9761f34065a8c5a49b13a7cfe18b5570/13123768282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=bourn+meaning+in+englishPDF link annotation
    • https://lapdonline.org/file/80870131856.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_off0000d20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20D 10608 bytes
SHA-256: c41c5fba7b2257acd8b7da12bb0775f34995f8fac7fa78091b2a89672acf4bea
font_01_sfnt_off0000ea0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001021d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021D 18500 bytes
SHA-256: 050eef9f239e44b88d56c5459603dd4021eff771bddcb291622d434e990ddb1c

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