Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4f72f09ec44b81…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 02:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1a231a22ce129bb18d95f01cb5b79600 SHA-1: b3421a1a90337d103576b34bac04a39bc6511e67 SHA-256: 7b4f72f09ec44b81b6d71d762fd10013f2c3df8803809bb5f4681ce1cddcfd0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The presence of ClamAV detection and ML classification strongly suggests malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=independencia+de+venezuela+resumen+pdf PDF link annotation
    • http://aftckwt.com/uploads/file/ropinufilatoradal.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/wutoludakawa.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/fusudojuxa.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/7e5added20016abcf9ff82b812f93060/63281822747.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/971383164.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/febixilafipakuzolakeri.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/dgvqo3rben9hnabh8jp4m4clb4/22028685059.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/20285267400.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/nasinugepazulufovogede.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/73824203538.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/gututojinumi.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/2161cdb8a0fbdae17c13c9c18dc8defc/kajegapubugojefa.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/21168287383.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821571d1024---81969588842.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/49174128036.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/57124e0b475e0417886d0568485771d8/xomoririwilulizowuwawuj.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/18985220333.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/54051312680.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/lisapuzorosijubeje.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee6ca7f163---86751010954.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079284751cde---46036229329.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021071604455029.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9d17e3eb7---pipudedamufi.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/47913700256.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/44266291484.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_off0000da95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA95 18536 bytes
SHA-256: 1de3c8c6400f294217d0166d9a824b0d4b7d35e10373c95036629e5be7c6bc95
font_01_sfnt_off000109cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CF 10740 bytes
SHA-256: 61cfa45a941cf071f0f7d3fef106b84d55a4dd78eb3e5d9680ed566d2094b69e
font_02_sfnt_off00012278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12278 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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