Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6da1216834419e…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 22:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 56d11355ca8753c1288d5849b183d4ee SHA-1: 9ce4ff6739c4081ec7d9c4434afc190d5d177901 SHA-256: ba6da1216834419e58b80e7054fdb2da703cffe4e9e203ee3370beed08d3fd91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. The presence of a link farm on disposable hosting and the use of UTM parameters suggest an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://spcinternational.in/ckfinder/userfiles/files/nigegisemime.pdf In PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614473676b98c---rijatejaza.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/zevukunativijamo.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/zilomaxufazolevekigaw.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/bt6u5ia3b8rd602hjdc5gpctnq/lodabogavomepoxevunupekan.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/39551662975.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/vugiregowutagos.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/39844622877.pdfIn PDF document text
    • http://vning.net/filespath/files/20210909190935.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/84787517206.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/61687101891.pdfIn PDF document text
    • http://huefpdf.org/upload/file/22737647257.pdfIn PDF document text
    • https://akvaguru.hu/user/file/8676134466.pdfIn PDF document text
    • http://analhospital.net/file/files/fufaledo.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc4a4d105---zolowubuvopugezovafexowog.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/70070857205.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414d9daf626---kagamusafizoxopapan.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/penujolarajoz.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/24678609592.pdfIn PDF document text
    • http://greenbelt.abwingsmd.com/uploads/files/22818373056.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/zarilegerivawenimozalumo.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/30828708747.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/xosomuxogotanunone.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/31885068723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=apk+application+downloadPDF 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_off0000b01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01F 15684 bytes
SHA-256: 855886830f4db469531c405cc4ac7a60d956c9e54a1fadf39d3f14d8230a3707
font_01_sfnt_off0000d814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD814 10268 bytes
SHA-256: c4272d8c2ffae9c997a49612b1c710704ff64b976e13904f052152e08b430049
font_02_sfnt_off0000ef5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1