Malicious PDF — malware analysis report

Static analysis result for SHA-256 2abdc01667df4bd6…

MALICIOUS

PDF

85.6 KB Created: 2021-09-06 21:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bf619e7c050380deeb5f6d5c15be9469 SHA-1: eb00f8c702f8b5b94a18025ccc09cb92da146eb9 SHA-256: 2abdc01667df4bd67020d9e7a47b1d798fb2d0868ede3f64e37c119fdadabec8
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the primary indicators are the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/1f5e37a24f02f7cf397d65170caf28ee/letubuf.pdf In PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/leloropape.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-5/20210905161258304219.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/lumupeb.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/pedinubidodipiz.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c2bf1b493---63865822832.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d036912bf---xukorifekitikovutobaxej.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/susilirivifotapuja.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fff8c36292---zidaj.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/uonjl1rbirpl07a8oo9m1v3km7/40021159205.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-3/20210603150927543141.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210614_BA41309C4F2CF4C8.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/nopisizanirowenawaxogeni.pdfIn PDF document text
    • http://minhanh.com/files/tefefobaniwulopanazonudo.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/nil6ce44jubflave9cqfjtu0h0/nowibipudunedal.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021051709215773499.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b14a3ca56bbd8bd491d994f558bd587b/91577759561.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/44211402358.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f5c60d88a---37075018284.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a4da5798341b526af5ae494880ecf869/31371798219.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6ee25100b---kotubamenedata.pdfIn PDF document text
    • http://landia-print.com/pdir/file/71270166486.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/rivup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=world+cup+2018+fixtures+pdf+bangladesh+timePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00012ea7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12EA7 16668 bytes
SHA-256: 6d08800b0736f2391037722e4c6772258e41b8ca8d20cac51f83e6a764eb07f7
font_00_sfnt_off0000c51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51B 20412 bytes
SHA-256: 4b53f30f7c2395827a47821ed14c4b84e9ba50d877fa8fcfdc63e42250ad9749
font_01_sfnt_off0000fa88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001129f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129F 11904 bytes
SHA-256: 8b38ff1526d403855593975ccd3849eecf017d54b619658c18b8327aee095461

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