Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc22ce787a6f5eac…

MALICIOUS

PDF

77.2 KB Created: 2021-09-18 06:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eaed3581f7cb8803e171c1a910b15b00 SHA-1: d98e9dcba321efd9ad618ab7a24da99e08429f48 SHA-256: bc22ce787a6f5eac5ba7d870ffeae14ec171b2d35be1662d025cba101f4a6304
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of external URI heuristics further supports this. While no scripts were explicitly extracted, the nature of the URLs and the link farm heuristic suggest a potential for further malicious activity, such as phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 5

  • 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=watch+last+night+full+movie PDF link annotation
    • http://alexlunacoach.com/img/editor/file/minoladumabov.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/66672784713.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/18833914042.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/79428529325.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/gizujavub.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/kozuxamu.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/93391121381.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/mezepajisasamobu.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134888a5d74f---zefizovatuturat.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/731e5239805a1fd6a17a4cd419989da3/58471496101.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/33592164281.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/ea0ccfe67008f9939cf7b3f200e88086/sejagijowuji.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/77942779328.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/tovaxes.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144dbd4b767a---42918338286.pdfIn PDF document text
    • https://aneri12.cz/res/file/49792526260.pdfIn PDF document text
    • http://strandedtattoo.com/file/wolewebemulifuxujus.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/gedomatuxaj.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/vosasezoxuzekigufodileku.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/60890405848.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210905164949124.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/c2530ccc51f9ccc2cd77350dd73d7843/tuxapezevivirupalirolew.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/89211034825.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210910135816.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/kumin.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/8801346415.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-13/20210913082026625452.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_off0000c765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC765 17876 bytes
SHA-256: a44480806c6dbe617c0a908e20aad906e9161a6f93d8425085aed3d0a8428f8f
font_01_sfnt_off0000f652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E69 10844 bytes
SHA-256: ead45ab97ad00529cd7f539be722fb70f677fba78884d494a7f2bac2c687c850

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