Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6eb7c6a83c3f8fd…

MALICIOUS

PDF

95.7 KB Created: 2021-09-19 22:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a3aaca218f144caf275f2fcdc6c8e2fc SHA-1: 983e781f85b959308837be734c89c3f54028dc7a SHA-256: c6eb7c6a83c3f8fd7d8a8fbe136d4e5540c6dd29f2b185b878052f3122f147aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links, many pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to redirect users to malicious content, potentially leveraging the compromised sites as a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=get+fake+instagram+followers PDF link annotation
    • http://kruengrangthai.com/files/files/90186991636.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/vakedujib.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/2085380326613f3a5614ba5.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303ea456ed6---99168289470.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/97110486876.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16144a991061b4---medewuremeles.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109121916507128.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c91dd3a88---lufep.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/melukolozitin.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161477739aebb6---21333970110.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/44355145158.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/vepitudubigadobosabew.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/74395099336.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/29121766019.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/2cfbb1fc94ef1f391ef36adc9476bcc7/zebapefulenalusebow.pdfIn PDF document text
    • http://chemicalengineers.ie/images/33467848109.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/bidovatikijofefe.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137641530650---lenewebebesomor.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/zutexiradapuka.pdfIn PDF document text
    • http://csp.hu/editor_up/puwib.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81577827669.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/92794845902.pdfIn PDF document text
    • https://makenie.com/upload/files/10116296679.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c55ee001f7548f8ba41944ac48e2569f/4553411756.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_off00010fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD5 10772 bytes
SHA-256: c012011275a17b146574e968e50924c13c596e40357df4b2633508049cec800d
font_01_sfnt_off000128b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B8 18624 bytes
SHA-256: 8806499b78ac124ade7dc65b76e6fcd04e50d530e42132359d35274b49aa1f76
font_02_sfnt_off0001592a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1592A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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