Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da4bf11aaa64aa4…

MALICIOUS

PDF

92.0 KB Created: 2021-09-16 15:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 43d51366fb41c8a907f32f9c086f52e7 SHA-1: 1403a311a79ef99d126c9d93ba03f706006117c0 SHA-256: 1da4bf11aaa64aa4760ab8f1c8faecb33d906728ea7e3604f7dacb40df445321
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious URLs, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://drafthe.ru/uplcv?utm_term=my+brilliant+friend+full+episodes PDF link annotation
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/abb4378550938e332d2df111df92bc21/gemora.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/gotidi.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf7de27f4---xaxan.pdfIn PDF document text
    • http://birdwatching.sk/media/file/bimosuvabugopuvumaxa.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/42797274145.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/vuvixinesuso.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/65557968997.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/20559354162.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/xorobixesaxawoniboso.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/68515085029.pdfIn PDF document text
    • https://equimat-cheval.fr/file/pawoju.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/18211293486.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413fccd2083---xorabezugadenumafakebes.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/26966098331.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/89373365132.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/lojovejujerigorejepubaf.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/48058976160.pdfIn PDF document text
    • https://shioturboapi4-xyz.com/contents/files/kejurobonosumenez.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/pamuwevusepawadowokaxax.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/kimasusagobuwepovele.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a9fbc4f9489f7ce243ff6697a2702ca3/5448659560.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/mojiwojikogiruvipazebo.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/71530710871.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1d141a8e8---63408287204.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_off00010330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10330 17836 bytes
SHA-256: 4910b58f1b5189afbfa864f9ee07d83dc18a39d593803367311aa479f9c64e9d
font_01_sfnt_off0001319f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319F 10840 bytes
SHA-256: 976d59387b2f84c6bd26d37ea3060d3a317e78ddfd508e4f7fdbb0ee42d5eb1f
font_02_sfnt_off00014a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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