Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d2b418d19659448…

MALICIOUS

PDF

84.0 KB Created: 2021-09-11 12:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 69f0df9b73985f499157cacff28a2338 SHA-1: d74faba3c6b868ffadb347df9f07e2099e45bff3 SHA-256: 3d2b418d19659448efae0e4ea992bdeaa7d9eb44237fd6098b6d01ec82fa5412
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains an embedded JavaScript stream and numerous external URIs, many of which point to PDF files hosted on compromised CMS upload directories or disposable hosting. This suggests a link farm designed to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://medvor.ru/uplcv?utm_term=sta+cruz+laguna+zip+code PDF link annotation
    • http://elhammagazine.com/ckfinder/userfiles/files/94668578566.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/xusepogif.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/mobekukarevu.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/27727100169.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/32472540976.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394414d7d48---42823060532.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/67298508651.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/gukipifatuluwu.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/10582027641.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b59d7b5a3a---golibopetewevaledepijis.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d6d80691e---nogizixomu.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/27086206361.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/tixogudutut.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/1470832071.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371a9e9801f---69430167506.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368d6ef08e3---javupewosazulunagejili.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c9789af22---pobikusibemasutug.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/xabewusem.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/057f240d0e91304e977d50146f3152dc/kukojeni.pdfIn PDF document text
    • https://cityface.cz/res/file/76757455967.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/jakafudinorum.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/vupoxufimifiriwiwopanemu.pdfIn PDF document text
    • http://metallpress.info/files/53988506715.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/mutotur.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_off0000e30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30B 10756 bytes
SHA-256: 991bbd28441029d1a0c6d75f049175c0e1109dfaa542f89d7cd4484986ed2bbf
font_01_sfnt_off0000fbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB5 17728 bytes
SHA-256: 93bc9285e514e7771d3525ccb2f122e7c2c64252e7657dc56d2b834ef55e861b
font_02_sfnt_off00012a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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