Malicious PDF — malware analysis report

Static analysis result for SHA-256 09790e78e55e36f9…

MALICIOUS

PDF

77.5 KB Created: 2021-09-14 00:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f5815e49675750a839a0e79f359877e8 SHA-1: 88ef177c32d2e775b326c325e84a07d7f7d1c834 SHA-256: 09790e78e55e36f9702d530cbf545de5f3497898ba288e766ff05928da10322c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to obscure the ultimate destination, likely a phishing page or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://agro-norwa.pl/userfiles/file/67701640891.pdf In PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/pozisiwipovesegi.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/94612853315.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/takepi.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/takefosinijilosegosuxu.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/sufosugikixo.pdfIn PDF document text
    • https://egf.tw/test2/images/file/37230768910.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/vujigerotixifolus.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/xaberegolib.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613969a05f4d7---nudedoporamemevoz.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/1687970412.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/85017674839.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/87461286977.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613389ec0dc5a---tibirimirur.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/vabedegor.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/fa704650e714dd29665376e845aecccb/83540207048.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/gitogopilumezebefeditafoj.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/balefe.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/movawixa.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/33eda1d8f954913a4bd4fb0feab1e657/40517723837.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/16530757479.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/satasaxeba.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/74152744069.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137294b8bb98---mumafosezatimewaz.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/29059521148.pdfIn PDF document text
    • http://princeverma.in/uploads/files/masuj.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326626de1be---81040684713.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/73803261581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pubg+pc+lite+apk+downloadPDF 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_off0000c656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC656 10840 bytes
SHA-256: 58158d475556d71bca35c11ea814b810c12b78e9a130aabe8882706b5481f2e0
font_01_sfnt_off0000df1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1C 18804 bytes
SHA-256: c34dbce53d2c57ac75a16e5b51e7716515771a96755731bdc435ada499736c52
font_02_sfnt_off0001103d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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