Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96a8d0c69dfd900…

MALICIOUS

PDF

85.6 KB Created: 2021-09-02 14:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c424b4d925dc8bbf52d8d4b1779b3c32 SHA-1: 11929a115cc298d01f94f4681901694e2c66740c SHA-256: b96a8d0c69dfd9002087f1a44c5ebccd8996c68f946c0a974de86cbcc76ba5b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9875

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 http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/47942088938.pdf In PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/23707728918.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/65556551881.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612acaf6d0e31.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/lamepavepimafasebujekiror.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/94257938191.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/70203379543.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/88421625528.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/43872305628.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/8c07face582260c03d44814598539693/tujelanujeratemanadepiwob.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/46405427727.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-8/file/favuretuxevimirurur.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612588ca03a1a---55629504174.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/mivumejabefan.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/0jdbv42jcsbe6k5c2is42hpmt3/83085919584.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870c49c4eea---vafomifotep.pdfIn PDF document text
    • https://ekaplast.site/admin/ckfinder/userfiles/files/70362215074.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/53222149316.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/nidixaji.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c3f6af7bb---jugowaja.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16072f8685442b---43273311081.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/56bd0803bca3ec76fd5f26d832db32f4/67258159024.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bccf2b82050---majigobef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ibps+clerk+exam+syllabus+pdf+free+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC154 11176 bytes
SHA-256: d48c0fdb0eb9825595fb3f15abd7aa9e58e36d1c55c53beaef450320c1a24920
font_01_sfnt_off0000db52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB52 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0000e34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0000fb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB60 21084 bytes
SHA-256: 19766bc50e5f3081ca886fbd6526455dad60adc2882e4dd45cadbe3f2c4edcb5
font_04_sfnt_off000131fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FD 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59

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