Malicious PDF — malware analysis report

Static analysis result for SHA-256 24a5acbfc5b40750…

MALICIOUS

PDF

80.7 KB Created: 2021-06-25 16:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a409d90b520ae54a129a0bdc21641fe6 SHA-1: 77ee73a7f12204fb99e0e614cffae44ecff997ad SHA-256: 24a5acbfc5b40750aa7b60f08958572c54910e91e6ef0a366fbe1c4b9728c3cf
196 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests the intent is to trick users into changing payment details or performing fraudulent transactions. While no scripts were directly extracted, the PDF structure and heuristics point to a phishing or redirection attack, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094670a66c85---tobizutokobokonuwibobeg.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/qg4gcokbg7oojgpuiuco1eree2/xanuxak.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/24fe3b6b8931c05f681898092e07563b/65838454884.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/89nueoqs3pr96cilemvqlgt40n/zosajozakeregebejafabu.pdf
    • https://mides.vn/images/ckeditor/files/44898355675.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a736644b63d---woxaje.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074f6e6e2733---99217197092.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/eb6c271a8ce5af16b7f764fcc12b3f1d/wizis.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/034d9c921ef60387e654a97852593c06/xuvokuduwigugaxulumi.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/fnv9aka75uqn8bppcibt0fge1v/webebevorimabozifukifiwas.pdf
    • http://clubselectionvoyages.com/images/file/19837066765.pdf
    • https://cleaner.pl/userfiles/file/18618236072.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7dea8d361---sidemojupe.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/f513ff152d7a341cb6c284f2a55eb872/17603373823.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+change+password+on+startup+windows+10
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d906.bin
acf947943aa4c2a3359fab0d9640804d825cae673d85d2647447a939209e32c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD906 16540 bytes
font_01_sfnt_off00010410.bin
f7f7c49b3cbd83ae2b958187b10200e872eb656e0865817e2bb11561d93956a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10410 11100 bytes
font_02_sfnt_off00011dc7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC7 16792 bytes