Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdea27df87086687…

MALICIOUS

PDF

78.1 KB Created: 2021-09-04 07:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ea285c1b28b24fd76b9df8fea2f4689 SHA-1: 01de81b9a7fd4c6f878ee99d3b460933a6b68a1e SHA-256: fdea27df870866879644d033690fc517b28d83f50835cd64afe2d972bfecbf1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the URLs and the PDF format suggest potential for exploitation or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chcial.ru/uplcv?utm_term=catholic+hymnal+sheet+music+pdf PDF link annotation
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160da22a5df504---98987450639.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/11133609621.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/8203565364.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d29941ee341---68997380849.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/592148473cb3d0a3215a732edf19ca22/texon.pdfIn PDF document text
    • https://aspirans.com/files/file/deximo.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/ljca64pfollf3913mlcmnmpt80/22620691218.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/229276bf01fa88f775b9ee7a54430ddc/6781832570.pdfIn PDF document text
    • http://nfc.soo.jp/file/91053293819.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/tofatowakidazegeneraz.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/n8g93clfigfs5ppl1n9c9c6a35/zopeve.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/56573064887.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0fc511902---43595826815.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/86498889495.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/76383586265.pdfIn PDF document text
    • http://teplospectr.ru/images/files/bimamutadedaxap.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/81140330120.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/19611326515.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/kubazunuvotazem.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/vubafuzaxuja.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/bamogesimixuto.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/gepiwogadajefo.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/ralabutejotizevoxesamu.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_off0000cad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD4 17864 bytes
SHA-256: e30ea701a59fe9132b58c1254122faa310c2043a032ec0a53264620bb54ee65c
font_01_sfnt_off0000f8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001110d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110D 11028 bytes
SHA-256: 166514edfc352c8798195cfbcf73bee99a386649e5c995b1904217dd4750e00d

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