Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ee54d0f66d0743…

MALICIOUS

PDF

87.3 KB Created: 2021-09-17 22:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 83d8d39a7a91e36e92513618d9a293c5 SHA-1: 3eb6fc60340113228885cfd4aac7b447bfd4d755 SHA-256: d4ee54d0f66d0743cff778de763ada5830141cd6b4751ec4409032a71de369e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://smidgel.ru/uplcv?utm_term=best+calculator+app+for+android+2020 PDF link annotation
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e71cd7ba39---witojuva.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/varezunamivaribugarub.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/lepokezaxav.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/3d9e7e8dc623bbecbb8e91f0eb745486/febokexopepewosozamu.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/gigebuworiwapoxubemizesal.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/venuvitofilaweno.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/rukopemam.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/dbbc4b292b75d08d8cb9f5e19c304783/bidevogosodakeraluwi.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/jejudesuxajo.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132082e3b0f3---591412616.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161328e426e5fc---8089059414.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/bagup.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/vibezosebamunemerutewus.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/68457862344.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/3530060321.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/48315800819.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/75598882238.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/biviwadikutejofigogep.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/kebitaxupul.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/69357306415.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/zakipo.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/pulaminilonajisenonag.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/44619892024.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/99b746cadeb3001d51c61f43efd76c10/bixizebedimagiz.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/91975420271.pdfIn PDF document text
    • 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_off0000f0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 11008 bytes
SHA-256: dc8c41fc7083a5c1fcb1f535a7962ddf9bad21735c1c7769a1da755d71bcbcf5
font_01_sfnt_off00010a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A1 17180 bytes
SHA-256: 822a19d03d0503433f0801db8dd033602db00de11358a09f8b62e5cfac9d9c10

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