Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a2a4cd2344ba3e4…

MALICIOUS

PDF

82.9 KB Created: 2021-08-20 22:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 034958a6a348a4d34484b25ef8b260aa SHA-1: 1de28d336a536c9f20160049f972155e3cbab796 SHA-256: 1a2a4cd2344ba3e4c7b0d44b48b5eb81b34c1e64fb23b0e7f7af30eedea1784f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. The presence of these links and the nature of the detection point towards a phishing or content-luring attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://philabc.ru/uplcv?utm_term=ganong+fizyoloji+kitab%C4%B1+pdf PDF link annotation
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc45623a84---52237178983.pdfIn PDF document text
    • http://dbhsreunion.com/clients/21010/File/vudegabapajonosusikoxesew.pdfIn PDF document text
    • http://merwepizza.com/upload/file/613546817.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/f0a3062f4ca2a714481dc2e2cdf9c61a/dojozijegutag.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/jvnqq7v5egns87esblf7skjfgf/gatesaratunixikipasin.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/924d1b46ac80867fdf28f73d0bae770f/gadijezominegadixid.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fba9c013ce8---87281150394.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/b159efdadd49e34222ef16e77d163a1b/14511942998.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/45236325158.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/mamasigo.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/rufarup.pdfIn PDF document text
    • http://capital96.com/userfiles/file/kegawipuju.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078d344b4ead---telebuxazafetisugopesuje.pdfIn PDF document text
    • http://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/fodomev.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/jugasofewadi.pdfIn PDF document text
    • https://oferta.lt/i/File/muribogumem.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd77385367b---34171580223.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/sobubodikuvagof.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/97dde16b1674945eb86706475345f7bf/newezevaronibirutek.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/xuvudisomo.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/begidasewodekene.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/51318368517.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbede58cc9---xaxesixukivoger.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_off0000dd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF531 18528 bytes
SHA-256: 172f2c44bfcc976a0d374808fa0c24acea7c30c3f91a586fbd07b8b44b939f49
font_02_sfnt_off00012294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12294 10892 bytes
SHA-256: 514f217b716beee77f8bed12193508a5af1ca660befe4a1da00d73b1e10790e8

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