Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88ea8e372c5a5d9…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 20:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b148ac787dc3d397434e7a8e14ff9e9d SHA-1: 4735bce2f08b5bda11fde95978ac55b0b4cefcbd SHA-256: b88ea8e372c5a5d9e7bd773062b75a39efc47128fd9c02cb47d0df34b3483cab
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a 'download button' lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=consolidate+two+worksheets+in+excel PDF link annotation
    • https://eastmanllc.net/ckfinder/userfiles/files/pikesu.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/23579445521.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/mph2u6k0d0mcfoom3qabbgk2j6/72804536679.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc3ce30e00---jewimamiwizutadinibenilop.pdfIn PDF document text
    • http://geodez.com/pliki/file/pitexibevomogu.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/joxamupukagenelumefej.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/nd29fshh00124qi83cpaktfg41/safezamisokaboxojiz.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/64315340267.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/muzosazetegaxilejazim.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/xumanevekebatovub.pdfIn PDF document text
    • http://drironcat.com/images/file/18947556943.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/xiwowigabibudekesuniwulo.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/076ddd9fbc2a3f16a9b2a32d4433a228/11846594902.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/311930036735.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/80045036807.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/kuvij.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/sopurowinapi.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/98813768087.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/rizedo.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b115a4a60---nozobutetoruwejukox.pdfIn PDF document text
    • https://wasael.com/userfiles/file/14259278641.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/icaoaub7na0c7ugemhtkm3i1ha/niwowupajebiwakuwu.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1ac116dd4b---5580097137.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/8869924958.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/wilekuxudidokazavizo.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_off0000de1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1D 18592 bytes
SHA-256: 2f755b975b710c6bba8b219816572d32329ceb0ebd9daf3e679c74a0f9e9e615
font_01_sfnt_off00010d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B0 10780 bytes
SHA-256: a3cd6e6b3a280e26ef8a2ee2886e9cebfebd9683f36c11fafc12b1356102ec81

Open this report in the interactive analyzer, or submit your own file for analysis.