Malicious PDF — malware analysis report

Static analysis result for SHA-256 a046e7b01eb1ac96…

MALICIOUS

PDF

85.4 KB Created: 2021-06-27 19:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: be8f230874feb3fc5b92b7cf8005da73 SHA-1: 2e66f1aa5c0ab7123f4c834abc63dd2771c4b03d SHA-256: a046e7b01eb1ac96315f195ae0b5398e2fa94e08073226d6a0404529222fac36
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The file's structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://cructi.ru/uplcv?utm_term=arithmetic+progression+class+10+hots+questions+with+answers PDF link annotation
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7f4de2cc8---narusogaziwimigu.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/23251786b346923bb54eba5a35a690e2/mokofele.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cb956c17a---30278514834.pdfIn PDF document text
    • http://df-foundry.net/d/files/7754150972.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607b513a5160e---befas.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f25a64465---jipotikudafete.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/2dbcac6f9afe061dbff6aa41d1a913c1/3528975857.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/l5dnkagla6k39vokcn7c30n08j/kazaxuvonanepoxo.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/98717534080.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98cef0d2ac---sigafabidet.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/b5ehv8gvai8a7sainj1hb3pso9/47506939705.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607953c0d7d7c---27805885412.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/d15ac64c49729b90703255edf5677dc8/86276178722.pdfIn PDF document text
    • https://lesura.net/userfiles/file/paginedilaxamorudul.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc400792a9---paposevavizovomikedu.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/bubuvunenuriserefazeziput.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/2g3cb7i5rb3bcnu1eqssv8prsk/tefarexumipezarorefava.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/97850536821.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8439342c3---kulesoxadajobavavuxemijox.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/6973e8e47788b28affa83f3289140f58/6666719481.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/tezepegesoruzonajaw.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/6a19f30a2587020a8eea75e7b889c776/79748890993.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e3c61d9e5---1587385926.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/55911435251.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/xigepugofom.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_off0000e662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE662 17196 bytes
SHA-256: 6a970a04d8296b76b7ff7de7f769d19c0f26cb098f764e28b1c635312cac1686
font_01_sfnt_off0001136b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136B 11308 bytes
SHA-256: caf4a74a2595686e22d070b3eb6439537dcfb22760f07ab6e6df9c92211772ca
font_02_sfnt_off00012d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1