Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee2af3b978db0703…

MALICIOUS

PDF

77.4 KB Created: 2021-09-05 18:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 21a270b7b91557d5ae614fa032c97e2a SHA-1: 35d604e8ef83e1d57c831a6389c3839752dc3e55 SHA-256: ee2af3b978db070315b9e4028a75b59d33fcc0ffc5a2244800a6c4a7a5211766
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely contains malicious content. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing pages. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ea964c9238f742da06c9d73da6a47b99/budizabenemelegabi.pdf In PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/10ba24241fa8bfa4a6391187f8ed3310/67498348773.pdfIn PDF document text
    • http://isvpro.com/custom/files/xipiwed.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fbfd39879---36913370650.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f771d8cfae---870137820.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113ab46d8c24---jejefadun.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609894b010232---fasirugukiwosulozusisol.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/rexoxojatuzabopogozubaj.pdfIn PDF document text
    • https://krone-murten.ch/userfiles/files/64972743996.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728706b0ad2---sovetezepu.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/kulidazotulek.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/ralejepa.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/xisatunolavebugapat.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16073f8ada9ad7---86331820387.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/koluwudavidamokasumag.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/kg3tjc5s8o8ks19oou7cv4f59o/65393891696.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/3450d977f2abb3f7586a15a48a0dfdae/52942512713.pdfIn PDF document text
    • http://starlightcelebre.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/nozobevigubitudosejawesub.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/76688400473.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/3ce7k0vvmjugfa0nak8jai0fr0/22139057597.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/73322310673.pdfIn PDF document text
    • http://slsnn.ru/content/file/noladofev.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a56566a3e85---gujoroforipil.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b3224fece---bivosavalogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=acknowledgement+internship+report+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fd6c1034d---rovaxilira.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_off0000cae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE2 16860 bytes
SHA-256: 80026ec8a3cf52a22026653223b9901cb69fad3e683656c7a19ffd1e960ed53a
font_01_sfnt_off0000f694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAB 11064 bytes
SHA-256: 698689f9171a64d53ac9b7c8cf17f7ca03dea2aeba222d37b8138ba8269f79fa