Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad48daf944e0096d…

MALICIOUS

PDF

90.2 KB Created: 2021-09-05 01:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f36c9811624c93bbf5c206fdfa9fd24a SHA-1: d90a0fe204b6101d0ba42d9e4b0d26d20f7ddcdc SHA-256: ad48daf944e0096d5aa440b6a96b589e28d98c206d49991b444c374221274ef0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076106c002c7---17675300521.pdf In PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/a2f14938b54991780baa1baa602314c6/neravakagurakaz.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/727e0ecef180ff4416c7d9757ffd32ac/94462738515.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/16521349038.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/fiwujewugebel.pdfIn PDF document text
    • http://thebaileyfamilyreunion.com/clients/6/6f/6f45d7e5c9279c15d0bd3a3fa6949618/File/xotonezaxelako.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/70655797845.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e336f16dc04---pojomedek.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/97971940815.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/23013557114.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/56666810345.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff4a60d9d4---papafovolexezibapadel.pdfIn PDF document text
    • https://yasacompany.com/upload/files/votilumugevavamezupu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ceru2vshcechcfa8v34jt96231/ruxolafudexopogefoxepo.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/b06309b46c2e677f5396cc9ea24754f1/dadexujitisiwudubam.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/3979217589.pdfIn PDF document text
    • https://wildnaturetravel.com/File/jekufoxesenufopifizigan.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d0ea9b596---11495954618.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/mulud.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9022436b98---54560223059.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/nogodavomov.pdfIn PDF document text
    • http://mesterek.net/tmp/30203493501.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/sisisulegeje.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/47979568110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=draf+revisi+uu+no+13+tahun+2003+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_off0000fa64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001127b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127B 11180 bytes
SHA-256: 4b73550ee9de569c9b78863d653653e66aac36c22298b30ea89d6ef74d588fb3
font_02_sfnt_off00012caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAF 17744 bytes
SHA-256: c7b8d70c112871efe8e3f9d0030fa3346a5772005e377b4a206e03d9559430fb

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