Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b132301bae92df9…

MALICIOUS

PDF

92.5 KB Created: 2021-07-18 08:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 54c778bf54e0cda55478503e34b0a692 SHA-1: 139eb4df2f7bdca5cc5da7c2586a1a1b602693c0 SHA-256: 5b132301bae92df950b6f3782dc89a880ec091219ff8b8933be0766e18682414
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/8r81v5kbqu8bt05mu5nr2p0t44/botapevogajibaf.pdf In PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f8049abd6---82713274673.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/vkpso1aqbjmgn1ffmeefsvgmo0/3704602031.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/fijuwupija.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/db8a1d6b0b4ffac1b82fb455c2b407e1/nowiwidesasuwoguluridad.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff76dae3a4---nufoginodimememevafamewi.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/4g00b29s9t0a31ifind4t0dbbq/folejitarikufon.pdfIn PDF document text
    • http://446888.top/userfiles/file/kusobamekako.pdfIn PDF document text
    • https://cargobull.cz/res/file/57751477570.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c130bbd0693---luvowas.pdfIn PDF document text
    • http://olympusflights.com/files/files/kegetubufixafivagebaga.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/b10355990b35e109b53476c18900b07b/zelijuxib.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607992e9b9fd4---vajawowaxepavan.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/zixozesigine.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/xuzivudipemawik.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ad5775781---fixam.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608418d280a78---66326482206.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/polaxuxa.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/16qojrib5k70kbgo8c8t9v83e4/90401603129.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/pawidalixutitidadose.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88654836c5---20131356897.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sofigukubi.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b632c7ec20f---vadixupiduzab.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/63513515553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=icd+10+code+for+bacterial+conjunctivitisPDF 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_off00010525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10525 11028 bytes
SHA-256: 5844c2ec8151be91b6050dd773fc196e85964ab59ff2fdeeb99bfb3c729d3d79
font_01_sfnt_off00011eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13701 17420 bytes
SHA-256: 20302ec274fbab29ac147503c6336170cf6186e2a82d95d240f843dbb89f5f48