Malicious PDF — malware analysis report

Static analysis result for SHA-256 f314146b35fe66f7…

MALICIOUS

PDF

93.7 KB Created: 2021-10-10 10:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: be17bf948a0cd7ef50d09ab3b5f23854 SHA-1: e29e3d27a066f1a1ab05e9c24bb56ad9c721de29 SHA-256: f314146b35fe66f78bc9b3390632414c3e720ce284ff1533afa2419f3650d0dc
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised or disposable domains. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://3e-recycling.ru/app/webroot/filesfiles/redaxig.pdf In PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161415fda40b0d---77389411434.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/bekolukijuviwiw.pdfIn PDF document text
    • https://flyags.com/editorResources/file///47360693342.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/wegidobov.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/miloma.pdfIn PDF document text
    • http://baoveantam.info/upload/files/60446332373.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/9837317709.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/2918092626.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/xuzupe.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/95877057703.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/sewekomekaw.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/wavosagameleniluxoposekuk.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/negadibebazubodadal.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/pewanakavisod.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-6/20210906054744259108.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/dipepetuda.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/152125630761556b86ab06b.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/84434112227.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/mipapurekosirowijixufivul.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/muvos.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/kilege.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/hksnbg77di0ad49jt57nnuug8s/54419063344.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/l0t60gum50lvjruv46uadhcvdu/76244746521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=i+got+tap+water+up+my+nosePDF 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_off000105c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD9 10708 bytes
SHA-256: 16257c95bcd6d0e1ec71842ad9f20ff2a751cd891b15ee42cae861b4499d0aaf
font_02_sfnt_off0001368a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368A 19684 bytes
SHA-256: eb57814d28c2b9ccfa166ec5f77b1964f68b02520563508ffb4adabc259db684