Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c9646d0fd95d5eb…

MALICIOUS

PDF

96.6 KB Created: 2021-06-28 17:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2b7ca7fd08a44dd8cafee481998f5570 SHA-1: 62e325e0f7a675ffb5c4052366de608ae2beb656 SHA-256: 6c9646d0fd95d5eb8baf20f8af5ba2e850abe5dc43c0c860650b1851df45f32a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or SEO poisoning campaign. The embedded URLs, while some are marked benign, are part of a larger pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://niestachow.pl/data/aktualnosci_imgs/file/63154056757.pdf In PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160adea5a4bd8a---47514278514.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/f13a8b9efec16211a1276966d4d66fed/53977557821.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/bcecaa0272afa5e791df586fc6d25486/zesunupogod.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081cd93eb16a---1161297094.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/dapemigabi.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/crkq2ceqb4f87rlev13qf78cu3/dodemugos.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/63375233573.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/43779752289.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/jemozixawunavikawijadiz.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/faxerudajotajal.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/51337636217.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/vivusumodoviv.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092c00d4eba4---74801917851.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/15403362685.pdfIn PDF document text
    • https://dietacud.eu/upload/file/mofikepuwokedowupa.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/j258uv9k22kc3gs0odq6c4p2pq/rosoxonigunamozo.pdfIn PDF document text
    • http://epoetryworld.com/clients/53741/File/56305891295.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/0adc58da27d5c474a4f83165df698ece/sonidoxote.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607500f701e48---nigawimujonekufuk.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/41404978461.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a324db9dd54---31431160728.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071623b6ec2f---rapuvawezure.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b30c890eb---71673479390.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832cea05048---43229605357.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/gatepubigina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=minecraft+how+to+teleport+to+bedPDF 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_off0001159a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159A 17776 bytes
SHA-256: aadb67d3d66d630102b9a223cf2f87c4d5d791c240fd9331e3c4852273edb626
font_01_sfnt_off0001441b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1441B 10768 bytes
SHA-256: f9fef761bc0f5f8d8ae7b1589153de097685ab5cf2f0eff0f49cd1a050a765dd
font_02_sfnt_off00015c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1