Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd3031a1eeaf97f…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 15:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0d1dd9b240d22af5efd734b26dce0325 SHA-1: 7d701ad753df6fb422c39163ec6d20ec22de1275 SHA-256: 4dd3031a1eeaf97fa4cd5b234d5c55b7cc28254ab34f8419f90c42d11e56e1ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it's likely a phishing or malware distribution lure. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, some hosted on compromised CMS platforms. While no scripts were directly extracted, the nature of the PDF and the presence of external links suggest it's intended to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=2016+mazda+cx-5+sport+manual+for+sale PDF link annotation
    • http://www.vljainandco.com/userfiles/files/nabupu.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/d5090f0ed9f4e6a0bf7cf0eeaefad54a/34271031739.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/28919578967.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/9979708171.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/66980912572.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/perukusesotujiror.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/wezatonujedapaxopezota.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/76915518141.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130367335155---57982225202.pdfIn PDF document text
    • https://rajakedua.com/contents//files/vomejenexevepidoxezodun.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/58299627894.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/bidekogokixesape.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/15254619713.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d284c4b1a5---79241507118.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/wepibenofota.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/96338582321.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/fodov.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5413afe23---tigisojatajagajawuk.pdfIn PDF document text
    • http://ubest.ru/images/file/nafosuxav.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/e053361750f1edf555aeafc185988c1e/namunipovijas.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609174af5ca55---wubivobaridodugivux.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/wesakikozivutubapokofu.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/rifeboxulolekodog.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/jaxomow.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/jalikurupoxemubu.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_off0000d753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6A 11484 bytes
SHA-256: 3d9961785e8088d62fd5895a00aba632d0080b563f8b8cd0627c4edde11d0044
font_02_sfnt_off00010ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD0 17960 bytes
SHA-256: 955c4f70e66f699d97e80a856ed29ffa6469e86d6eae2f9a6c2159e72e4744a6

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