Malicious PDF — malware analysis report

Static analysis result for SHA-256 527e024598dcce84…

MALICIOUS

PDF

74.6 KB Created: 2021-09-14 09:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3233dd1410b8a0ef71c91c29684e535 SHA-1: f9c282cd582b44c07a7e2832c393ea33dcd75a01 SHA-256: 527e024598dcce84d94eca6b6f373a10e7a8e29d9a8fc55d3e85a966bb0f542e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cructi.ru/uplcv?utm_term=dr+stanton+tl+swan+read+online PDF link annotation
    • http://qdsenfeng.com/data/files/zuzelijotigorakasefu.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/j67ikbj21rbe2r0ifm4poqater/64467229383.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/sifotusodifiputojutin.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/6506957149.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/8f11f0306ac9dbabf57a3612bc7acbc0/pugezakizike.pdfIn PDF document text
    • http://arablift.net/userfiles/file/56985996635.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/lirujirerusuvifaje.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/bufunijapusuvetu.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/kerejimaduk.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/81335185227.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/21090118070983045949gnm.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/13259311064.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/kidepukefafuxamilit.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/jerafofonelon.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613174a765d0c---1078020232.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613c463a704c4---jisijudujegobarezad.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/29485443068.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/01f291df6b13ba88fba66af3e9fd67f3/30151242432.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/pagosuxopinesotip.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/9757947356.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/7cdd94ef4c3b64fd953636505691e97c/bokubisubaxitokaraxipinuv.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090615423273499.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/toretaxufum.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_off0000c206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC206 10328 bytes
SHA-256: a43c9b66a28c82b20d2f05acfac71342db4c44d31b069e8457a5ef04e8a6ab84
font_01_sfnt_off0000d97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18D 16696 bytes
SHA-256: bef81c904ec669cfef3b896a3f2bec167ba162697a95016c158efab08ed8b53b