Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da8561fc4b25946…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 13:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bd3cbd3bb647c34d3ced6a48a3c9ac87 SHA-1: cbd17a40f97e42afc06d048964e7a111872ef88b SHA-256: 8da8561fc4b25946c005532432cb631230f2f44e14785ec35a6c28c172bdb6d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://accessiblevehicleservices.com/userfiles/file/51167200984.pdf In PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/buxokidowosele.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b47df5162396155faeacb1b94a04ea6/99901547121.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/09bca515f6fcde218ec124c8e0ba4c5e/93880474027.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b19c6f2cceb---lesiwevinunojipuda.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/fusexode.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5403521490fe6c5decf78b320c426d5f/befefumu.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/48342696406.pdfIn PDF document text
    • https://777mto.com/contents//files/runivugenakugekugabizivad.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f846bab5c---sonibub.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ad0d36587ae35239d640d8a808a972d0/davimuzewoloxekulajegu.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/likeviwimokerofipozutipap.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/dbb8vbugda2jlcdi4q65gi2ies/75826166275.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15001332592.pdfIn PDF document text
    • http://altinay-law.com/images/file/bowipibupuzaf.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/mizunozekisakiled.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/8037802030.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/vaxuwe.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/20002528089.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/tulupatemo.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/86018379811.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18a272f17d---mimefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=descargar+calendario+lunar+2018+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD247 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA59 18880 bytes
SHA-256: 39dde727649bbd2ba715e6b32bbc3b0168686b03a59400d6e9b2444225f41263
font_02_sfnt_off00011b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B84 11300 bytes
SHA-256: 2deeb5f1af5e7e37d3d7156248c91721e257d4e44024754af05d650f8bc01b2d

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