Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2e1d2f3160fe1c…

MALICIOUS

PDF

79.1 KB Created: 2021-09-02 06:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0a3539bcb5971924c8ab6001d9f5d1c2 SHA-1: 94bf5b3cb87fa1e585b440619729c5c504672a29 SHA-256: 4f2e1d2f3160fe1c604fa8856bd1388b5476c3b6e0c34296176df77be2a4f281
156 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 WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to click on these links, which are disguised as legitimate files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/vajejetotuwoput.pdf In PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/gemubosonojirafefu.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a23c194de4---85370131183.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/60826070854.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b53cc60c072---28034683329.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/goximubijig.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/mediwaparimizifisejafuga.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/18923966792.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610087b88f0bb---koromidowaxamasidamemetug.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/uhlptlb0uco65crj3sb73b3k7q/vepezavigigewelojevup.pdfIn PDF document text
    • http://cichanski.com/Upload/file/53583070609.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a36c919bb1b---54798584624.pdfIn PDF document text
    • http://charivne.info/images/file/gopefunadedirotuzubin.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/pibopodufab.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/39231160224.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/10653568098.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/13117714159.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/bipowenugopusimur.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/gapamupepuxana.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/bulipofulosixit.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/dasixirawodufidetuvipako.pdfIn PDF document text
    • https://lemanssrl.it/file/savowarugavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=molasses+and+treaclePDF 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_off0000d486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD486 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 17000 bytes
SHA-256: c9a08b1c4de56c256ba4b0976ed4794c28d61d3da5c8550ce20dd78bffd5535b
font_02_sfnt_off00011886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11886 10264 bytes
SHA-256: 4d3f98cde1db863d47bb2925dc73bf1e5a1e0bec67ff3dd3c91d06becd6a854c

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