Malicious PDF — malware analysis report

Static analysis result for SHA-256 5edea3abe86e35dd…

MALICIOUS

PDF

70.6 KB Created: 2021-09-06 08:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c7e620d1bb9fc10c3c10beba8d4623de SHA-1: aad495e1c2a43f60c5681a3a378c76b7de46c6ef SHA-256: 5edea3abe86e35dd2ad2c319d4e36a519ba65a5e09e17924873abdb9fba513d4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript, which is a common technique for delivering malicious payloads. The heuristics indicate that the PDF links to multiple external URLs, some hosted on compromised WordPress sites and others on disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of vulnerabilities or the delivery of further malicious content via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://spacio.hk/attachment/file/fogepifebinolod.pdf In PDF document text
    • https://reniuved.it/file/manewitikono.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16088287724fce---wemisabimenafu.pdfPDF link annotation
    • http://chromatographvials.com/d/files/nimenerevawaxafoxikaw.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/74219999098.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0929fea16e7682d494d45227b3056980/mewulofutul.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/40096651079.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/lonazumidamowuduwibivo.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/8405541022.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/55164038391.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e6d497300---68699301160.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075277ce0b0e---divewatopowarinutatomaj.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a53988650---fifafiwamug.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/wuzumitimutomazigemix.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/64484423721.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/41006873820.pdfIn PDF document text
    • https://isosklo.cz/uploads/pikuruwel.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/qcea00gs96dvqgnq0bbq7i1gau/28136584318.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021061118020772.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/7p3mik6d7o09ic97j5lv1ld180/5831138781.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff00ade0739---siravupupuxeluzorudar.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/96933013470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=derecho+internacional+publico+caracteristicas+pdfPDF 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_off0000b522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD39 10956 bytes
SHA-256: f4d63908d330227bb0f515201688f5511fee706e19911bc12ecaf089090fecf4
font_02_sfnt_off0000e64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64E 15516 bytes
SHA-256: e44c45ac729c6c3eee33d85b60d289beef2875db1f9bf1815af8710ac05ab789

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