Malicious PDF — malware analysis report

Static analysis result for SHA-256 188c5bb9abb61f18…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 22:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4c5967b0541ae5fd87f3bc1d9a1f3bc3 SHA-1: e39b9b677d3c9d3ee4ee75f999fbd617364f7fda SHA-256: 188c5bb9abb61f1880653bc2d7125faa5116d3b1f74db85db525e8d390bbd5bd
156 Risk Score

Malware Insights

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

The PDF document was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and disposable hosting. These links likely lead to phishing sites or further malware, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab32725e05b---87088783090.pdf In PDF document text
    • http://suarezbeltran.com/aym_images/files/32803244018.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e5baae3239a68247bee27cd54f7a4fa7/fibititu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16126b75dcab88---96344682627.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/tidijafolisevom.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/19900950111.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/2r5fgmo1nb0tv7u4o2b2s8svu4/vowozogawezanodejis.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/ninaretamavusefenowowozom.pdfIn PDF document text
    • http://4bx.pl/public/file/xadelovabusax.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/23070509452.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/diluxagos.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/gezugegupuludixakoj.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/6427228807.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c965d64e0a7---mikavofiba.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/61551600168.pdfIn PDF document text
    • https://rendiamovisibiliglinvisibili.org/file/48945866647.pdfIn PDF document text
    • http://stadiumhighschoolclassof1965.com/clients/0/00/0080f9a3d0f10e930bcfc39f0a940e94/File/lotupinutivopaxiwedewojav.pdfIn PDF document text
    • https://fallsplat.se/file/xusatesonaraj.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///98565829721.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0f921d3e6---72352887208.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/74193498472.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/758da677f7138dbf04f762122f746df9/6934821959.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611eb1cedd106---93426027525.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/wuvorafumomovobubuvipatib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=sweet+words+starting+with+yPDF 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_off0000e2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC1 18968 bytes
SHA-256: 50a60e62d6b4e9733c93705e0154da1214b750cbd6e1a75ee8f992477be4a6e3
font_02_sfnt_off00012bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF3 10756 bytes
SHA-256: 6d95b175d775e55fa95d7b56b65d4cb28d3826feb910114d1c452209d26d2676

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