Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11f69e06899010e…

MALICIOUS

PDF

71.1 KB Created: 2021-09-28 10:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 55997ab2d6442d8d313551b1fa1ef545 SHA-1: 1b711aae3812057288c65fea1bd9c2d1b6d30ed0 SHA-256: f11f69e06899010e44accdd9a2a096accfdb3a2d515c8c69f0e69698325420e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. Heuristics indicate it functions as a link farm, directing users to compromised or disposable hosting sites. The presence of a 'fake credit card online' UTM term in one URL suggests a phishing or scamming intent. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/47679212625.pdf In PDF document text
    • http://ever-pioneer.com/upload/files/42207916646.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/2c6e3513d99379a3b1805abe8c9243c8/xabaxazagilatuwitejezotot.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/43332621506.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/15993708423.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/969a0aa5f24b7e0504d660fba205337a/lefemalevizowazuvamopejo.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/51209870654.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f024064cb7---tolewunigubuwux.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/78339356827.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/kakif.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/58601588986.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/963dddf7b04712900abe8b86a143a571/neted.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c5676b937---64111038745.pdfIn PDF document text
    • http://snsi.jp/image/news_file/53705886198.pdfIn PDF document text
    • http://autoescuelatosal.com/galeria/files/3794346929.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/kimuratoxupixabosomuginus.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/38389522054.pdfIn PDF document text
    • http://taociren.com/upload/file/210909192126044293rikt5gy6mvi5.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/30820950790.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/muwalofarazixelofivirepig.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/84563594128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=fake+credit+card+onlinePDF 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_off0000b1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FC 16980 bytes
SHA-256: 862440bb9f5da6d41dcfc86d837eacaa0ad9e42d55c3ca523c31835e96aca2a6
font_01_sfnt_off0000de22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE22 10264 bytes
SHA-256: 9ced82c29aafd78f1e6b87625531f8026861deb1d39d421e4c6c8a9ad301a007
font_02_sfnt_off0000f54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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