Malicious PDF — malware analysis report

Static analysis result for SHA-256 e403ec13f2de195b…

MALICIOUS

PDF

73.9 KB Created: 2021-07-23 16:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 47d04fb42b4de1d3137a4ca900ba7510 SHA-1: 3929e9e74b2d66badcc88478c125a49532c90796 SHA-256: e403ec13f2de195b34253bc64c1d2da7ed9244cc0606f14f7dc5f357a0855b25
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms and disposable domains, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of it being used for phishing or to distribute further malware. The document body is heavily obfuscated and does not provide direct textual clues, but the link farm structure is a clear indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://pfhotel.gr/ckfinder/userfiles/files/12726292298.pdf In PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed07219341---kufuzawuzemufo.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/duxakexu.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/pisasetovakuneg.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/b27754a5d1e67437ca0f344821f067d1/64037146175.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29f871523f---jozupademona.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/josidupanuvivazodetuxuzor.pdfIn PDF document text
    • https://nadamasristorante.it/file/76585786607.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/xemaji.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/mufedanefakepixezefel.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///lotenusifopim.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/56634979251.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/2ec82796abc90ae0a563f03aa4e24c5d/xaforofadunuwu.pdfIn PDF document text
    • http://ahchala.com/img/file/50864901724.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210620150810.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/luromij.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/manunimalofewulijur.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088286ebd142---29659367810.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d6c9aaa42---jonububurag.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/6820007113.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/36e4a2573fd8179bd8085772c0ee0589/pulurukekokikipaperiwar.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/38089737358.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ba319e9a6143b50dcc7e5046c7862427/jutukumopironawumumep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=somo+talking+body+free+mp3+downloadPDF 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_off0000be36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE36 15676 bytes
SHA-256: a305541b40a9d17cb6da87b2be415fdd96312346f4449500f0fdb1431e3be977
font_01_sfnt_off0000e669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE669 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE80 11352 bytes
SHA-256: b6d18f68fab6390205010570bd9c543df4be0bb06ff8e4594de3031c365e05c2

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