Malicious PDF — malware analysis report

Static analysis result for SHA-256 899c3cd262a71dfe…

MALICIOUS

PDF

76.7 KB Created: 2021-06-05 13:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 13eb1d912489d32faa198d81bf10466c SHA-1: f45e7b33cedd804f3434e55616d0c8ac41a73c48 SHA-256: 899c3cd262a71dfe69e4e1f24cef04bdd4f7739078dcd2e4433ddceea0959349
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised WordPress sites and disposable hosting, likely to facilitate the download of further malware. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=null%2527s+brawl+stars+mod+apk+2021 PDF link annotation
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3a9fe2901---99491867988.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/s20a6gqfao1ud8kea9rffapng4/ralosogerujafexa.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b08c0ed2746---92013454509.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/ccdb758f9411963a4c777c1c73114b7c/22668161284.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/e37f4eed28f6815295bac9fb5a050461/48540221655.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/weginaranijifusokutu.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764a9967e27---juvepulegevafevofufaxok.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f263c6d62---26140265593.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/g8mng2a3qi1nagq1th8cdhivoa/41246416381.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/cm5gs5b2jq2litbrru26in2kfc/27420987625.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848f8434dcd---44405663682.pdfIn PDF document text
    • http://gptools.net/userfiles/file/vikiranosesixaxodo.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/77938546022.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608d20eb087ac---dapeguf.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0d32a8e92---39415668871.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED13 5732 bytes
SHA-256: 4e81da638f18cb5581e4d156c13fc9c2f03ef6f2c0b3bf84b4a831cfda154c8c
font_01_sfnt_off00010098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10098 10972 bytes
SHA-256: bf73f978e30a212e9b9fd48b9ace7edc93de10a73307a321b0103ef607f2d67a