Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b5f571b7a1ab09…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 10:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a02ede59b1d969188a613c979f262b47 SHA-1: 22e6fc2a353d9b7905d554bf7c1463bfa424785f SHA-256: d5b5f571b7a1ab0929d3cc6acacb65039bbdc179047441fde4f2627bf22a0e1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns suggest a redirection mechanism to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://planet-for-events.de/userfiles/file/kirorijex.pdf In PDF document text
    • http://maha.tcnme.com/chop/multimedia/userfiles/file/32953422098.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210910_7A0F4EED6EDE5143.pdfIn PDF document text
    • https://porfic.com/fotos/file/xekubizum.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/mafepaxitamofovovarojeb.pdfIn PDF document text
    • http://htygroup.com/upload/files/riwexo.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/52211980819.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/47203538659.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ufull8gtit7e74ge2hn3dniroj/valafuzulisivese.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/fofid.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/gilokosaga.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/surozelado.pdfIn PDF document text
    • https://dhesient.com/media/74730678575.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/getatosetixatuxizorek.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143466a33111---43047245105.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/90002037631.pdfIn PDF document text
    • http://szm.hu/userfiles/file/3982790303.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/rhvuu1m3i21tkeqa5rs6d9f3ms/jawuretexaz.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/66297760173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=free+hd+themes+for+androidPDF 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_off0000d8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BD 19688 bytes
SHA-256: 7c675afcdac366a8a6d9f8e79a4aec5f898c06c492a4070a021841486ed7f254
font_01_sfnt_off00010c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12428 10548 bytes
SHA-256: 608f1b2be002f4a9545ca523bd606c4e1f17f2be80eb60e062483dc0290a3a89