Malicious PDF — malware analysis report

Static analysis result for SHA-256 3caf6fa1bdfc68c7…

MALICIOUS

PDF

89.5 KB Created: 2021-09-03 18:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7c2a5d100425617f361f511849700200 SHA-1: e82695ba17fa3605bc57d24eb05642a390eaef28 SHA-256: 3caf6fa1bdfc68c70a06e9077573b36b86f3078763ae3c73170ce19d0159d3c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://irlanc.ru/uplcv?utm_term=expressing+a+quantity+as+a+percentage+of+another+worksheet PDF link annotation
    • https://zippy-inc.com/app/webroot/userfiles/files/zefejilurozedujugal.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c60996e537---karizamoje.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/91820049664.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc002c32bda---39393381388.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/9699141124.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/fezanigatolaxexalu.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/midexenog.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/9e56e6qmhqpdu1ft2ukrgorm96/38089566752.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/bbe21b99cbf33d7cd46c2a9e7021d9d8/91613548761.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021072417213950.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/95373993260.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210821043148.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/13562792439.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/wijuromojet.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/159a8c9854c0e68781fdd3e225b5b3d0/67070396303.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/88307249685.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/lunuruwezelil.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/43458316823.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794a45394d1---69464126310.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/1vhkr3qhf1p20dl4eftess9u3h/kodakutipaja.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/80294684210.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/553412515.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C6 16268 bytes
SHA-256: 17d5cceadd0f7c35e869b83a78c873285823283451864cbce0c3b5a892c59a3f
font_02_sfnt_off000109b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B2 11336 bytes
SHA-256: 813657cf71bd3d1428177d9521f74eb598cb9f2e4781fefc077b707dd5a4b7e4
font_03_sfnt_off00012426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12426 20472 bytes
SHA-256: 80f18c3b82b720512e83dbab4427042692edd0d2f826cb2465112544e26280c3

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