Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b7b3fd22a907a8…

MALICIOUS

PDF

73.5 KB Created: 2021-10-05 04:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9f8201684c66170b5194c1c0a7c15fcb SHA-1: cfc4f8f8956fe7c4390ce76b8fba7e7ee018f93f SHA-256: 17b7b3fd22a907a829b05ae331f9c2cb93c63bd34cc17b1ef43be399a74c861b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly support a malicious intent, likely involving phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://crysiq.ru/uplcv?utm_term=deed+of+absolute+sale+doc PDF link annotation
    • https://caribemed.com/userfiles/file/9469965638.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/36963256929.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/84874655252.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/derulituke.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/nejazan.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/xexowon.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/16265980217.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/sewafinowonedimurosimaj.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/zemizigenavasefavoduju.pdfIn PDF document text
    • http://scpt.it/userfiles/files/miwiwagova.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/nisurupezumavali.pdfIn PDF document text
    • http://knipia.com/userfiles/file/kilugufisizotufopekap.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/puxomatiwopufobuzu.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381dd7c7534---29290614762.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1615b70c616f36---govikirozuf.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/cjc7dursenjim75t5abshq0el2/zerudilutududugu.pdfIn PDF document text
    • https://doitoutdoorz.com/file/wfblStoXKCDPinu0.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/e6eb8b00a5f5844623ee1306db6954ff/71114251090.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/varolirixixamudad.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/lawegevuwup.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210929073553.pdfIn PDF document text
    • http://tatooazh.ru/files/files/mixupisabo.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210904180655.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109061549355950.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/15699784572.pdfIn PDF document text
    • http://irths.com/upload_files/files/41411287001.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/29879400993.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_off0000be7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7F 10416 bytes
SHA-256: 71a2f6379409789c77e6f93ccd4a14745bc6d5bef3995415c1c7a8e8c14f19aa
font_01_sfnt_off0000d647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD647 16276 bytes
SHA-256: 1fba51088d3111b300acb7e0af1ceae37fd32a2a23f682f92997d8c6e9b61231
font_02_sfnt_off0000ffe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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