Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f40fca2fe11299b…

MALICIOUS

PDF

67.9 KB Created: 2021-09-29 09:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 991ec8193123c28ef9ec46e51d65d8fe SHA-1: 82991318616b2d5ec5573c2d3b501d6fc8d0d9fd SHA-256: 1f40fca2fe11299bd06fe6c0889fd6f5bc59efe37917425f0242f6e8a6d10195
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload storage. This suggests an attempt to host malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely facilitates the redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/e4fc7e6c3de22aad81a8cdb5a1b3e8aa/60469646552.pdf In PDF document text
    • http://kemnhapkhau.com/upload/files/34322174518.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/wigolixuvafibe.pdfIn PDF document text
    • http://eoffice.erdenet.mn/asu/editor/files/55263938582.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/41555811063.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/11347452698.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/30779457937.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/vidofebajipurudujobubi.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/90877448340.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/wamazanabowijofuw.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/jemezejuvanubop.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/77691721831.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/77045201116.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/32029807033.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/pofuwuteb.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/358c2ad74c75d49cd53f93b85950ca60/xasijezixinugubizemefi.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/28914267142.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/38744764893.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/vivumeliner.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/wulazomuledudadido.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613935960723d---16352747863.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/1689160434.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614c6b2e8125a---53190533461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=news+live+nowPDF 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_off0000af04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC716 15004 bytes
SHA-256: b077609ff0e7bedb8155ac00d049d40bc5973e80e6c490a0bdc33406746401ec
font_02_sfnt_off0000ec8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8D 9868 bytes
SHA-256: 93ac0a7df7a4df74080a6dd99aecc31c9fe57000892f05049faf79eb47031f09

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