Malicious PDF — malware analysis report

Static analysis result for SHA-256 490ee86f7f9fa859…

MALICIOUS

PDF

87.4 KB Created: 2021-08-12 23:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 51c160ea7c425a23d913cf8f03c8f50e SHA-1: d9e464202c88f1809bab48ddb927d5a69da0f24e SHA-256: 490ee86f7f9fa859e4d6e1a23eb9c57c64dee767a0c345b7f6aa0d7295220c0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the PDF structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://coretry.ru/uplcv?utm_term=tia+portal+v15+manual+pdf PDF link annotation
    • http://foodchemsino.com/d/files/94779411177.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4b8bee6716d5ec60638187661fe45546/34883727503.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/90969352980.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/21419928896.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/paxemaxofufelitubewodexo.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/zepirarewubav.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/balafuginif.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/xamemulipelivadivud.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/99166341960.pdfIn PDF document text
    • http://salt17.com/userfiles/files/pamuwowodawemubiroxa.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160887616bb382---bunovusakesagul.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/24057362629.pdfIn PDF document text
    • http://euro-ex.com/pafusiruwafutaxedezefa.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/vru2i9c4lvfv0ask1op6uqoo7u/70762110938.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/04159fcbfd805f3606e45876b2d9ef0a/noniketamusunalifowuwur.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f30bde56ef---30248794179.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/5049052626.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/berev.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2420a30d91---76006267560.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/20960456599.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/e8c681b8631d25b34ac81bb8125c9cf7/88357235643.pdfIn PDF document text
    • http://beta-rc.com/upload/files/99669564948.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/sozorifuje.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/ba215190b3a25649c1ec11298422809c/fugekijilixu.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/2otgo145elenuku350svmafn44/17268190011.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/lixole.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b92cae87f53---61234177437.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_off0000ee1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001062f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062F 18900 bytes
SHA-256: 6c5331e5d4fc8ae2cf9e243602ab5a2d63ab2b607fe82b7df1b14cce551a671b
font_02_sfnt_off000135e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E2 10676 bytes
SHA-256: d7cec0ff372b35de6844c6051e44c40ef6dd4361767fb969649c602bf7c3fb40

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