Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7bf01abe0a1881b…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 02:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b1c24aa4807d4867d1b72e68cb67662d SHA-1: 1daa61795fe6fa8ae1d75471b39f2af899527adc SHA-256: b7bf01abe0a1881b156df5e05291136479015270c250c302e0f5cb75a6cd002d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to malicious websites, likely for phishing or further malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://chieucoingason.vn/files/jonokezipupofunimexe.pdf In PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/2g2bo60acgkavt99ensg88ih4a/11210715619.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/mozib.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/49443254018.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/d7ce3172ca3e55082f58a57a22842126/85938560833.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/82961260249.pdfIn PDF document text
    • http://effektfilm.de/files/file/65524784283.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b595a418c74---kifej.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/vobose.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/61c9e9dd22bfe841ba65b321915d973e/77771855876.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/b6fa68eb1d71513c1868a6b0bec58e34/69968434034.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/6bac52fd47ab08685dfa5dc8621b4f34/bananowo.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/82504608319.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/tt0o2q1q2h03i7uo21qg4sr490/vodezafelenefavidimaja.pdfIn PDF document text
    • http://moon-villa123.com/CKEdit/upload/files/79793819261.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161237bde23e1e---gajofaxoxizep.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/12918393749.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/e261d8f7e6fc5c95c5ff659dc347c0a8/wuvonogilojoxina.pdfIn PDF document text
    • http://clingac.es/d/files/7878499360.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/82012612942.pdfIn PDF document text
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/lumemifejusivawog.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099c98098f1e---rubofuxelemaxuredufigoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=best+quotes+of+ghalibPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF802 10728 bytes
SHA-256: a63d2b02be733ca45bd992da4f3fd56ecaf1ffffbeff287405950349ba920e9a
font_02_sfnt_off00011080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11080 18016 bytes
SHA-256: def94e4ab63c6ad2724088245c586c87b24a01cca23f5ddd21c1430028a00dea

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