Malicious PDF — malware analysis report

Static analysis result for SHA-256 9605f183519af749…

MALICIOUS

PDF

80.8 KB Created: 2021-09-14 09:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7557263eaca49344d178894796a0341e SHA-1: 7e4fd1a8b56e80460aa937a73e482bf8d4a4b3a3 SHA-256: 9605f183519af7490a674d44640bf70893ecc66d222663443bd038ddc95180cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or perform malicious actions within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bluebirdcanada.com/FileData/ckfinder/files/20210908_A44D64BE51DB1AFB.pdf In PDF document text
    • http://msslink.ru/userfiles/files/sukazujagamev.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132fb148b03d---supovexiziz.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/babakodegene.pdfIn PDF document text
    • http://lactopad.com/uploads/files/vetowopare.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021091214313224.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/16221359994.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/rusunewugigilusazovimo.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/ruzekowa.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/fuvefutakir.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/mezatovepafeno.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/47109078778.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/bibotaripasuboluwodi.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/sobivedarani.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/bizarurelado.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/46667852630.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/53099684034.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090119253691.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/terolodepiravi.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/zakex.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331b30b9370---30670622235.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/502nanp7gn0sq9pchkglkjejb7/mubanuxugatukumopis.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109020005264442.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/80427455634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=apk+data+editor+no+rootPDF 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_off0000d82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82D 10244 bytes
SHA-256: a3321913c84e11b5a2ed3d4ae8aa0ed553ea43f346632ec78d38be86768648c2
font_01_sfnt_off0000ef54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 17628 bytes
SHA-256: af25fd4bc2024de811ba5d2a2b9f3e8705359b520e9e8f10019f8a319828ba2a
font_02_sfnt_off00011d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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