Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bad68fa89b8a959…

MALICIOUS

PDF

86.5 KB Created: 2021-08-10 05:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a1735d248c87fb6b922a0e917c0ebcf9 SHA-1: 9a1501286e950992f80e6398dbcb925e30bc586b SHA-256: 9bad68fa89b8a9599bcee3a4480280c369960eb211a89ea8e64f9664f3db30dc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, with several pointing to compromised WordPress upload storage. The primary attack pattern involves directing users to potentially malicious external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=journeys+practice+book+grade+4+lesson+2 PDF link annotation
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a435f3b4b---nilowo.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///14070206513.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/820ccd15d7e524b248905a2d65a117ea/zevawa.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/pofawiradowomovoz.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/46273340438.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/jegamex.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/26871062763.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/nigaluwogovisejur.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1621444160.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe2e7dadc3---pegezoguxizotuvepezagukuz.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609331b0d5376---govimalijajisawupemeb.pdfIn PDF document text
    • http://koala-al.com/d/files/vodoxobopekurojutojiralu.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/84540914318.pdfIn PDF document text
    • https://ayurmitra.com/files/file/foxudewexirefojeloxidan.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/i3a70bdk66t1lrvcvpvr3oiua6/vawedejo.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/upagfg6vk1ltd42m2cj1fs2rau/31275367689.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/75529722237.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5964b7c769---bexabodadavekopujezo.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a594661600d---69899110756.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/80674354655.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/negodox.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210716_151818.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_off0000eb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 11324 bytes
SHA-256: 2766cfbb3efa8294177419dca95558324f2fba1f31ea574d7869f1d0d5841078
font_01_sfnt_off00010611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10611 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E23 17312 bytes
SHA-256: a74900eb440adece2dcc209d92b8146965aedfa27b69b6973853e1cce485d226

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