Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd12bdb9872d9d5c…

MALICIOUS

PDF

78.0 KB Created: 2021-09-05 04:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 275dff09b72bc3da74e55777392970b7 SHA-1: a15c499cfae0f82c8a51b28778ec3d8ce349a34a SHA-256: bd12bdb9872d9d5c03c443fd518daee70e59ac47387b161f73f9ba3fbd04532a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. The primary attack pattern observed is the use of a link farm to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://turnyras.lt/Files/file/26448068204.pdf In PDF document text
    • http://midel.me/userfiles/file/12399555987.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/74888398711.pdfIn PDF document text
    • http://519pf.com/userfiles/files/birenadog.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/38070598809.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/86148764265.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/11806107644.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/68446016590.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/7066734584.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16116279b00426---78093190029.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/xalutewemopabutimasowil.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/24895523398.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5da505fe0f---tapipokepila.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1610bb8ebbf752---nupowavatuxasekupagewovaf.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/gedutowunika.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/fazinokukesijefuweje.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/vidotaromubezonadari.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/fcd687cde4de548b55ca2bca33f5c3b5/kesozopijisotopukarotel.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8228b0c61---gemojafudezon.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/zaxojivevi.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/82878477067.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/68c6b7115408b1ebd7c548b285ab1ff4/rozuvajumusinitevud.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a748de9f938---48045752072.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/4a4768a116e246538e58152f90d4220d/gutaw.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/9d8d2bec2269061cf0b4df4cea2e2eea/tawidamodi.pdfIn PDF document text
    • http://agama-rc.com/upload/files/jamirafejofovupepun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mentes+perigosas+pdf+download+gr%C3%A1tisPDF link annotation
    • 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_off0000c7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B6 18224 bytes
SHA-256: 4a48ceb1c2f56a64477ef01ff3362357dcc9fe5bed760c33ee148922120462bb
font_01_sfnt_off0000f6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F4 10932 bytes
SHA-256: 7c291ca7ffb0b15ded70a5841fb552d19293086f57c2e19705b7b39bc3c8150c
font_02_sfnt_off00010fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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