Malicious PDF — malware analysis report

Static analysis result for SHA-256 4273fde88bda18b7…

MALICIOUS

PDF

75.5 KB Created: 2021-08-27 16:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 97034e1498c1b1b5b41960f33246a579 SHA-1: a2d217a50f33916a3aee857e1ae341c5cdcaa4e1 SHA-256: 4273fde88bda18b787065bab3be09e70a798348be8daef94dca3527423d579e6
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. This behavior is characteristic of a link farm used to distribute phishing lures or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://garglob.ru/uplcv?utm_term=diploma+in+clinical+medicine PDF link annotation
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/kovebodilojobureba.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/06b77cf65a1cfb62ef88179275852d48/96675521862.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1dfe25536---movolasavevajofora.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/o48cig60id55iudod7g2enacrh/33522790211.pdfIn PDF document text
    • http://ahchala.com/img/file/94794294604.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/87067157620.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a74a9754027---bilegimozoxenuzefudep.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/71550957876.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/45efbefe6388a632717731ad69f1b7fe/34863485056.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/mubebalujor.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/xisepilidigopamexavo.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdbc52a41f---44245772826.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/21269915650.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-17/20210717191353445730.pdfIn PDF document text
    • http://prosquash.by/data/fikuladerotitixusabizej.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/2323692000.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/mojazigijerovafuwapowe.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/83hjqmoo6o98774c2mmt4r9evh/40416003145.pdfIn PDF document text
    • http://ranagro.com/files/koxulugiv.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/rokix.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/xafojiremifes.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/98266384396.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/26145816016.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/74atvdbpft5ujt51aimqs7uss1/708734189.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/7637645477.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_off0000c6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000debe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBE 10308 bytes
SHA-256: 967ebe944b831e88f8933e64c52511ab6420b0e9e540f1cd80815fc36bf921b2
font_02_sfnt_off0000f5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DB 15956 bytes
SHA-256: 6205af1399677a9ebeb12a5e073fc3f78daddb6edde9fb4448b7001282932d26