Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0f0052c67c7b31…

MALICIOUS

PDF

92.0 KB Created: 2021-09-04 13:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e298348286d4f7238239012bc54fbda9 SHA-1: 83a217a148f4ce793a8007091729629561606af0 SHA-256: 1a0f0052c67c7b31f7a94bff2d908cd3a8fd13e5ec8adb990dd25fa2688f584f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to various compromised websites, likely to facilitate phishing or malware downloads. The presence of an 'enable lure' heuristic suggests the document may also contain instructions to bypass security measures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://infrive.ru/uplcv?utm_term=nagios+xi+manual+update PDF link annotation
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609838c15c80d---64066342493.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/sefejenel.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/sfur08k7igi4ml30q75b6ptqac/zevovidakig.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751ec1e9a98---61552504722.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/6aff647013d72ae0ee164bef0257941a/norajivodezizojuxef.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/ketegovi.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/5051878671.pdfIn PDF document text
    • http://chemsdano.com/upload/files/gadamefufel.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/8enu9uh8dqiad2aoe2940n7la5/12731720402.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4dc6a58d0.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/55079469a6743dbe42a63dbffad022f8/13913182247.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/44722546106.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085df6fe1a48---74136332079.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/73106132407.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a132ccdc67b---16096806989.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/lobosikima.pdfIn PDF document text
    • https://onlinendttraining.net/files/84337378332.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/mibufelesege.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/27823715612.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/2778855977.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_off0000fde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE1 19988 bytes
SHA-256: c53408fa913179798a06b43bb0617046ba9195c7bfac96ea608ed3c9d0297707
font_01_sfnt_off0001324f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324F 10812 bytes
SHA-256: 54350fae7183ccc8440b7d23849f86d5c531530ea3ba4b1696c1eb23fc8b3174
font_02_sfnt_off00014b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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