Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ff7c1926bad198…

MALICIOUS

PDF

101.8 KB Created: 2021-08-01 04:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c19d61453061789c8605655e12d962f5 SHA-1: e782c8e52e3ed15aa6a0265f3638dc4070f987b3 SHA-256: 73ff7c1926bad198601bdcd662df05c5ce3e77ec9e47a7d300caa0d8c5ae39aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript, though not directly analyzed for malicious behavior in this report, is a common vector for exploitation in PDFs. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/vepuxuzasepakewas.pdf In PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b64359c196e---vunufisoruvagasodofogex.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/bitebuxe.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd17d84fd3---zukasu.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/86296756802.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d5f4c86ccfa4b6424eb105fbc735d238/vivujotigenimazal.pdfIn PDF document text
    • http://euro-ex.com/zelokimavivutowefovupi.pdfIn PDF document text
    • https://bdata.vn/upload/files/xubavonopop.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/137m8thu95bg8a9ugbanpuvlen/latijawunamedasovanufov.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/26493253568.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/56d5caa0d0d0d2cc931d17aef3bc9e09/doxiruter.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/xejaboxew.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/witazubog.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/muxepomujexilowazeverup.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6f85218ac---pijanuxo.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160879ec320477---5183731079.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/a75963b2205aeb20b92c61eaf5719e3f/13314119335.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/36874010127.pdfIn PDF document text
    • http://fairview68.org/clients/c/ca/ca24e3df3ff7fa9b839de6c08aba9959/File/45093187879.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/90305426242.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2f8c92f1e---bekiputariroko.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/7bedd655095e2022a96513ec8a85bf47/93524671924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=super+mario+all+stars+%2B+super+mario+world+rom+gbaPDF 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_off000114a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A4 17488 bytes
SHA-256: abfaee95274982a4214d1b5e6c2afd072e690f70c50e29060751c150980b8322
font_01_sfnt_off000142c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C2 11032 bytes
SHA-256: 35dac368b0290ece067cfce31e1daf2161a67e49811cff1175d533a98638af0a
font_02_sfnt_off00015c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C04 5636 bytes
SHA-256: 9b316533fb60f72569d1470152270d356b43c6a96ae257586a201523df8812d3
font_03_sfnt_off000170b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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