Malicious PDF — malware analysis report

Static analysis result for SHA-256 26480906cf742950…

MALICIOUS

PDF

69.0 KB Created: 2021-09-09 07:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a0da03543ac0353a0afca386b027f440 SHA-1: b1991ccc097ee94cb13961855e37860b889ac3dc SHA-256: 26480906cf742950fccc974abcb0064b8cf17af496e1e5d45d4ca60b4d8fa9fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating embedded JavaScript and a link farm pointing to compromised websites. The presence of external URIs suggests an attempt to redirect the user to potentially malicious content, likely for phishing or malware delivery. The PDF structure and embedded JavaScript are consistent with common techniques for exploiting PDF viewers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=cash+flow+apk PDF link annotation
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8iq8cadeqmlr0m58h8te0lurv/fibodanogejaxe.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/7726030741.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/tijalofifaxajefilubiveb.pdfIn PDF document text
    • https://jingchengs.com/jingchengs/ckfinder/files/20210903075147.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/85491470281.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109090838403071.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/vajuw.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/dukuluxezezopekive.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631163835.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/69166893008.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/doseg.pdfIn PDF document text
    • http://ttc-investco.com/img/files/duwinatomuvarevuranimi.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/beredefobutetor.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/161392b5c38a69---sogozefel.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/89425651955.pdfIn PDF document text
    • https://digireg.at/upload/96525218963.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/59899502635.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/11981102886.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/6713136515.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/34215291067.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/bolupiruxadaga.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/14639444435.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16135ce516e663---mebitesonurun.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/66910084300.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_off0000b226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB226 15152 bytes
SHA-256: 2fc3eafeb3f5b4eb2b1398c64bd7a564cce50d52ffdfe769f07d3dce90a992b6
font_01_sfnt_off0000d823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 10140 bytes
SHA-256: 0d9e7245fca0d0f0100c2b1ec32f286063a1aa90c1c8a728182564720ea77e14