Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ce4cc9daeaa8fe…

MALICIOUS

PDF

72.6 KB Created: 2021-09-19 02:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2d1020ce24ce848a2d2fff2db4feae7a SHA-1: abe4ea16fd2e2de6a6448c84e2701305386e52cc SHA-256: 20ce4cc9daeaa8feb41dcf33f65f0a968b4a8011a2f68c96d4901659c4670079
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded links are designed to redirect users to potentially malicious websites, as evidenced by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://synerhu.ru/uplcv?utm_term=fatal+real+estate+traps+exposed+pdf PDF link annotation
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/toleze.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/gupuzat.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/87636128728.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce2a2a8dee---49991481649.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/todowojazax.pdfIn PDF document text
    • http://fruitvita.com/files/files/vofenubez.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/jofuvivafagu.pdfIn PDF document text
    • http://vtaky.sk/media/file/wepulan.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/sibeledovozijovekuwuwir.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/jisopulun.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kefipaxorofuzuvo.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/dufubodafo.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/ziwitenopozavewidutawu.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/21477413986.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/kaxusikewemakerifu.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cf6cb1c6c---rogodubolebadimaruresas.pdfIn PDF document text
    • https://novitas.ro/files/wojavuvizoruzod.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/26780862560.pdfIn PDF document text
    • https://kenadong.com/contents/files/puxepukedu.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/gemodejolowijo.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/68815481013.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161425284e50ea---55820501032.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/mojojakaluluvavo.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/aaf600e42834151a677f946d0c0e07db/66294947486.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/22452354716.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_off0000b964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB964 16884 bytes
SHA-256: 524ef30953c51b627072db8aa09a4d5d48999d7388e6bc7cdc96e87c770532ca
font_01_sfnt_off0000e4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD07 10376 bytes
SHA-256: 05788eb36349633ddff4f2b0aa832b2e2a7dcb2da571fd368df11903ae59acec

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