Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ddb4f7847615fe…

MALICIOUS

PDF

80.4 KB Created: 2021-08-17 01:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: da63c46931569c0a39bc585488ab4015 SHA-1: 751187634f667ef76014dfd7f687ab489523524c SHA-256: 18ddb4f7847615fe0819b705eab4e3d4c90d8a7265bef3d6d6242a2866d0c241
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to multiple compromised websites, likely intended to host or distribute malicious payloads. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest it is designed to redirect users to malicious content, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 http://parkety-patemal.sk/files/file/36400295399.pdf In PDF document text
    • http://briarcliff68.com/clients/71184/File/jeferexonofadukutu.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/89391efc7e100ebb87f6609d75495c07/debuwuraxivomuluwo.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1233f01d2b---7113590116.pdfIn PDF document text
    • http://carszana.com/image/upload/File/zavenudiregawixokuv.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074caa277da9---62589285730.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/70689990839.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cad9a095e4---zufurevipowuzo.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b21cb6c28---51968768679.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160de48feb0a33---20485756892.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/bdc2da53b4883ea992808597cc586f50/42932557672.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/97368870162.pdfIn PDF document text
    • https://pmms-online.com/assets/file/33393730144.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2e093586c---lefizunorisiripox.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/46037541774.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/depamapowulopigozidu.pdfIn PDF document text
    • http://abc-tel.ru/data/File/tamizi.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160a8efcf3fad4---lamajoj.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/jetax.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079e45595b11---fokejodi.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/tiwufozo.pdfIn PDF document text
    • http://drshapard.com/clients/73598/File/80979389103.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac49ebef4f8---22509846405.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d4d87f2eb---sitosigosunited.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=granny+chapter+2+outwitt+mod+menu+apk+downloadPDF 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF69 16264 bytes
SHA-256: 133d0d2289b945c3adcae7fa8c995ee036c23395d56052fcb1ad074e969310ac
font_01_sfnt_off0000d56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 16816 bytes
SHA-256: cf91c2449ae19bda06f2a46238f3f17d4b54bda2e7e7f48ddba8e65ad96881c7
font_03_sfnt_off00011983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11983 11160 bytes
SHA-256: 2bb2cba1bea6878161c940ae9ff95c32de3124b85a8e6b89d21b47477b54ec65

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