Malicious PDF — malware analysis report

Static analysis result for SHA-256 670c5dc45b12b7d4…

MALICIOUS

PDF

90.3 KB Created: 2021-07-22 05:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: da3359454106aaa3bd0a01b46876374f SHA-1: 82e52b5976cb5f1ca787c1dc9957a1f35be7c832 SHA-256: 670c5dc45b12b7d4dfbded93b104e4a370662baf45e8e13a66357aa96b49f7eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links to potentially compromised websites, including one hosted on 'entone.es' which appears to be a common pattern for hosting malicious content. The presence of multiple PDF link farm heuristics suggests an attempt to direct users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/20506930301.pdf In PDF document text
    • http://work4shop.cz/userfiles/file/gemewebalasimiz.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/31a8c8e488f89b7b05647170f5d753c9/15940971394.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/17120565256.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/67371742190.pdfIn PDF document text
    • https://mytopics.it/uploads/file/1682689397.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/puxunizugusu.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a136deb90c1---kepamawuruzafukenev.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/f4544224dab5f9d698b6fe98ea4ee95b/8244968369.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078650f6e88e---91405770272.pdfIn PDF document text
    • https://tisuputih.com/contents//files/11551028799.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/90833262651.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/93946294075.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/76fi325vtq95dplr6q8hhhp1a2/gigorusetubajiroridipajud.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/96121791377.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/86562059951.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/13435372929.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fafd03a0ca---48414590711.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/15246596097.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/vefelojulixejut.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/efd877014b4802321a1bf96218337593/64559916147.pdfIn PDF document text
    • http://kimthienbao.com/userfiles/file/40783467500.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/zajekedegoz.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/45525612877.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e1da9aaae---81147136302.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cd9231f5a---funixifanabiwimaxig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=color+combination+of+straight+and+cross+ethernet+cablePDF 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_off0000fe38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE38 11092 bytes
SHA-256: c9bc551a7847e9fd03701f5bf208722298400ceed290513a8552fd568763cf5b
font_01_sfnt_off000117b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC7 16444 bytes
SHA-256: e6143e60b9c1ecd1dd87872971ebe1a6bfb13b8a6c4baac6df5dfc86eea5e5b3

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