Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a922b25affd4f6…

MALICIOUS

PDF

85.1 KB Created: 2021-09-14 08:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c72165fe28c393ed184e34a096ed593f SHA-1: c953a6c15eed3d7f1e99e294ddce8533f54a4142 SHA-256: 05a922b25affd4f6cbb9ee4c59a900c7e981a3150155216f306b574f20b5e67b
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 or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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 http://yasaitogo.com/uploads/files/23918173642.pdf In PDF document text
    • https://baobiachau.com/luutru/files/25309919141.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/28390791158.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/55412482010.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/lakujaleru.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/jajasiferomu.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/tasivuxus.pdfIn PDF document text
    • http://esistore.be/userfiles/file/22722137454.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/24810879146.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/7dd44beb9b49fc7d349bea0fd1448966/15911040940.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c7d2206bd---bedasaxumukedet.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/50728534056.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/kijowamopufudunukedu.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210901202247751064k24lno78wl9f.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109021131252120.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/55728609293.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/mumofevosofal.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f36d1530a6---47961293479.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/kigirexa.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/66213657521.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/8476854229.pdfIn PDF document text
    • https://hse.tw/upload/file/fosalesege.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/revupijiduja.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/78173818244.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/96612517240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=el+deseo+prohibido+de+doug+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD969 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 1948 bytes
SHA-256: b033f7fcbcd390b2cb396fbb5f03ef01f7ca9afc151f9d9df21604321f961cfa
font_02_sfnt_off0000fa7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7A 10636 bytes
SHA-256: 56bc92fef8de9fb5d0287eb12051d50ef87be33ab42e0e93112da2bd10abcd32
font_03_sfnt_off0001125e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125E 19740 bytes
SHA-256: 40b7f3f5d9b093f02b6ba5995a8a0cb67c1596cae9575b7268bbef12262f287f

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