Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64659e82371a21d…

MALICIOUS

PDF

78.5 KB Created: 2021-08-04 19:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ee8ffd51eb80c9bc6cbe5265277e6066 SHA-1: 52de6f0729f61bf0a2c92ec46f74f08e5e1df6fc SHA-256: e64659e82371a21dd43ccf75b91c3b870a859ab5ef58b21ef604bafb59b8f4db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites hosting further PDF files. These links are likely intended to lure users into downloading and executing additional malicious payloads, a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091595371e40---3743035069.pdf In PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3cc4e2e61---fesadologo.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608071ea4100f---60725500117.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5ec19cb07---gujiporevutikaw.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721e499a36e---fexuxonerevinuxusa.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/7838c0a035c702a5cb5a9d62e8059ec7/doviketunin.pdfIn PDF document text
    • https://x-software.cz/data/file/firoroxufalugoruf.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/25141488746.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/ae3f7a8b4c294ec7038ac8963534fefd/58158316575.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/tikok.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/85859514726.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021060311035660.pdfIn PDF document text
    • http://mesterek.net/tmp/bowedipekigatemaf.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/sinafimipupomabep.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/balerevasimamib.pdfIn PDF document text
    • http://ipublicity.cz/data/file/42420158302.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/tabakaguzilaje.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/2e6v3aha9s3nj38pt3483d19e7/zaxefidixexekopifek.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b39f730ff07---73140118803.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f21c009ee---gexemufikaji.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/83567465680.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/gasogaxefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=farmall+super+c+engine+serial+numberPDF 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_off0000d05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE873 10716 bytes
SHA-256: 4b39f19858b2295e8cae7eddd304a11760ed2ddf7d9fbc2ac2acbad88ea3a1f7
font_02_sfnt_off000100bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BB 16572 bytes
SHA-256: 7d9644d36f945434a9447d07bb0005fcc190d034095c9b8ca7f8093d9d63bf13

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