Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee54c497169e02bc…

MALICIOUS

PDF

75.5 KB Created: 2021-07-29 19:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a1a9b91339fa61098be2132686a2c787 SHA-1: 63d3689174f70e542e87fb05142d3f90888ab255 SHA-256: ee54c497169e02bce2206dfda9e9db55270b126b9938108902a4e26cefa45948
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress installations, suggesting an attempt to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are likely used for SEO poisoning to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://garglob.ru/uplcv?utm_term=emociones+que+matan+pdf+descargar PDF link annotation
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/i1k31a2k0vkaeueh54dge9qoq9/zikavalamemana.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160992603d3add---85754835532.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa029faa334---12762588544.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607419f86244a---93175300130.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfe9fb7a1c---43368628450.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2d4ec3b81---4729064940.pdfIn PDF document text
    • https://melz-feu.ru/upload/84555390187.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/81570074757.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/surowovimedodilikuko.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/ed6b901dae0075d8d1f6c130134ef320/99497172824.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/bbcf44035bb065f2f51f008d6d95bd2b/porinopazixevabegi.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/zofaretaxunuwiridid.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/96462a634182f2948cf29b9ae4aaf78c/fitijoj.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/54484679236.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c28a7db4ec---57566079754.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b801f68f0d6---93717256764.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609502bedf8a3---11585895290.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/cb91fbdfddbb940e4337a76d87bbbe64/semelif.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be2e4e7ee36---18715092203.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/98622233976.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc88934b4---9166577174.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/860a00189a3cbb0888f63dc02856270a/nowumi.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/4adea0bc174fea46deb23cea9070345c/wakusabuxubonas.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608be5b1631e5---85356249370.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/23seak5bltd94pp1ckd76i423l/tejokitumoxuxidikupon.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ed7819d7472---rulemoxejavafik.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_off0000c1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FB 16932 bytes
SHA-256: 0bb7910e9d844584381f4b2f9e6dfa3bbfddc780c840beb26a095829066e20d3
font_02_sfnt_off0001050f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050F 11144 bytes
SHA-256: d37fe47ba476646ad446539a14722295eb286e1a18bf92f48488b6e899daca16

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