Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ec99d5d6494f58…

MALICIOUS

PDF

69.1 KB Created: 2021-10-02 16:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e977dc88c618aa981cb4d9cadc20b1fa SHA-1: 903a54b21f235e8ee1347ebd3ac74135e8a3c0fa SHA-256: f4ec99d5d6494f58b7fba40367c0d684a6ebfa28a1569765d33ea134271e63c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains an embedded JavaScript stream and a link farm pointing to various domains, some of which are hosted on compromised WordPress sites. The primary function appears to be redirecting users to external content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://www.msjcongregation.org/www/js/ckfinder/userfiles/files/55670682021.pdf In PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21578075071.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/99696046907.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614073667acea---68260857750.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/58109992157.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c5bcd1682f---23618304698.pdfIn PDF document text
    • http://homeopathyhk.com/files/vurodiluvepuritoletis.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614dc916d0a36---92182239861.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/nogaw.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/24591159510.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/kafomakarusepiralat.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/nofepufotuxiseni.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/dabawozumowekav.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/36583182452.pdfIn PDF document text
    • http://generaldistco.com/images/file/kanobifedunajobowuraduni.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109190247426586.pdfIn PDF document text
    • http://119pump.net/d/files/24559492447.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/55585327873.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/9797304431.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/64272358161.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/dazidonafojubadodinuj.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/20495949756.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/zosefidoxilotawomud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=legal+anime+streaming+services+freePDF 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_off0000af00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF00 10584 bytes
SHA-256: 70e5eddd2bd740abc702fee7ecf7071037f7244a3734e8f31688522d6ad73884
font_01_sfnt_off0000c724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF36 15140 bytes
SHA-256: 52b03531ca3fa416b0ba9a7b74d3f6ebb3efd807c2c9d19785cd3104c5d12bb3

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