Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40fbb119d33588c…

MALICIOUS

PDF

87.6 KB Created: 2021-06-24 04:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d822157f0c4beb3e9215dfa953fd674a SHA-1: 9422f89059ae4da0d48a5b2a8b30ec29021ebed5 SHA-256: e40fbb119d33588cd51fbdee651499d1a8d42eb016e29363f0704a780437f19f
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 0.9997

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://krisoc.ru/uplcv?utm_term=watch+full+movie+hobbs+and+shaw PDF link annotation
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840ebb3c517---13087314425.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/eab0a00054aebfedf53b932088e6696f/10174071209.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/70daf87ba2e798188786951b932fb02e/15969045813.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/qde9jvn3lb375nlm3akrenkh5f/gogugepolevuvupewog.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/89189329041.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/986044262ab54f13494354f00eb179ff/28079562437.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/h4lkqctnv0nb93ilado88pc4p0/soveluvadolebem.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b752e864776---wiguwuwuxulerutojo.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/xaxumigijuvoxoz.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/04cefa88a85bad5a9d77132520a59baf/gakomudiwaz.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/faren.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/nijotudademamep.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856f56050b5---zomigizilivujazugavovolo.pdfIn PDF document text
    • https://harvestrain.com/wp-content/plugins/super-forms/uploads/php/files/194bbc2095c63415306c80073ad4da6e/22629151456.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/zawelizaxazivisedufaf.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/92587948533.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/5gdr1l2g23nidlurqqumvu3jqe/kigufukajugonerirokulug.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16075fd0ae0cda---77856314562.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off000108c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C8 5352 bytes
SHA-256: 8abdd7b2b21bae0785b75b1e8ef52e9d7ffb63e9027fdb4aa81bdb03754ed16c
font_01_sfnt_off00011af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF0 12332 bytes
SHA-256: 15b170cf579ba3ca4609f2b99c49fbccc0d67894cddb4dd360d8d569da4c43ee
font_02_sfnt_off00014365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14365 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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