Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4638949f8e933af…

MALICIOUS

PDF

120.6 KB Created: 2021-08-15 21:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: dd2a694f729845f51c13a7f80b47bf54 SHA-1: 6a0fba18c09a90d3612fad62d3c52783a090f22e SHA-256: a4638949f8e933aff0363ca1850de7576dfad0180ffd9f8d2c4c38d657ec7ae8
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=hyster+forklift+fault+code+177-3 PDF link annotation
    • https://luyenthitoeic.info/userfiles/file/77367205202.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/bd9c842264d55e0f226bd01a71a16041/bexekofojazagagawepi.pdfIn PDF document text
    • http://www.bash.cl/media/file/karepodefepife.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/07/files/210715112603.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/wakojexowo.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/vodabobuloruvonepobodupem.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/f31ouo2b2aig7m6fr9f026b260/zuzib.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/26453043392.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/mrsbp9prcvfp3fsssqugshcgno/87759598779.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160820e15bf136---64083123483.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/75803620123.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/xugijevap.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/94947751422.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fdf92ef1---nutune.pdfIn PDF document text
    • https://ready4use.ru/uploads/files/vaderepije.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/nolororiluzuzivaj.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/5564573230.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/xotowazokokezoxuluwi.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/203745f47bde5b6c9f8bd58054d76feb/53717023822.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747ce0ba136---xiwidasopeguzilage.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/moguvinu.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/lobatijopamal.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/04a581e93d9d8d2de95392ba43fc8b33/782204986.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_off000176d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176D1 16816 bytes
SHA-256: 09629ccf6a5ec8f64db0efda38e0a8cfed1839a75fe211ebbd1131d24d43f942
font_01_sfnt_off0001a2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2B2 10968 bytes
SHA-256: b836e87daefe6867306116eac6b64e91e4b5531c6afb44371a732870c06d5f1b
font_02_sfnt_off0001bc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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