Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbe6dc61e1c5701…

MALICIOUS

PDF

139.5 KB Created: 2021-06-13 14:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 41824e9b441f5f9be6a6471a568d2f8a SHA-1: 178c2be80ffd2d17e8b1460138b56a992ba9945f SHA-256: 9dbe6dc61e1c57014340e87bfe04dd8624b24f0f0fd80cc9a649b95770075f7a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document is classified as malicious by ML models and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various websites, some of which are hosted on compromised CMS uploads or disposable domains, under the guise of N64 emulator information. The document body, though heavily obfuscated, contains metadata suggesting its origin from wkhtmltopdf and a creation date, but no direct user-facing text was extracted.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://huntic.ru/uplcv?utm_term=n64+emulator+website PDF link annotation
    • https://peterdegendt.be/file/45420455664.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0a2b66bd---laxipilebise.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/tigeniwa.pdfIn PDF document text
    • https://room12shio4.com/contents//files/78346980453.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/jb8cgtd1r2t4dps2jjhsu91bl2/sawebusifasamoripuwewabe.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/jowuniwumoxowa.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745070a41d6---26179745512.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078698558750---37659013145.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/3122a034334fec1fe88212f5dd200c00/fatavi.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/1407361225.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/rimevunugamevatimin.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/63428281120.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/ravitukirupopojofufefur.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087b4f7bf856---suwibokilevubipe.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/890accf7eff2db4fe556a261290e8a72/79189021410.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001aa7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA7A 18696 bytes
SHA-256: 3b88093ba0f25c55d731ec88c9278de780dcf77b30fdb337a474b9e0cc1533bb
font_01_sfnt_off0001e64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E64A 5272 bytes
SHA-256: 41498270c844362d1b9e1a8727bece94fb4fbf49db414dc18a4d77cfa78f852d
font_02_sfnt_off0001f83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F83A 12056 bytes
SHA-256: 18d2afe174070efea0cc51c8ecea7782444569e481ef1d1f52353f6ab1b2536d