Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e29f331c34154c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 19:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2e0f49cfbf33eb7e0eff9f133bbf9798 SHA-1: a9a93de621af42394416472845d11b474865848c SHA-256: c0e29f331c34154c15bdf65c8a07768d19c4cc88a6ce11212fa2123886003510
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, pointing towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://pixomot.ru/uplcv?utm_term=laporan+avertebrata+air+pdf PDF link annotation
    • http://www.pzkexie.com/up_files/file/pomosejizidibedojeragiri.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e393cb0c863---87594027236.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/36fcfb0cb489c3cfbc86942613076407/talexexufebovemato.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/34820927183.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/56428570022.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/54812289164.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/16157361875.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/suduperamif.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/71785ed77bd2a24ad27d7ba538d41b29/7651512141.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/sivewenosiwoj.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/24793287613.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/a3e711904da837cab6a0018bff49b345/58159067231.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/eni28mrkqcndkc9o0jn94tmgt1/famirofupugoreniwikugad.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/tulidigilepaxekobaludumap.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e912615b5e1---baxizef.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/37796949008.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/57053768209.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/54829086220.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/fodebukusimadutumaponewi.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4ece19e49469a16bbc163d8b674694d8/96395357483.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e55ac27824f---88252109481.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/fomiseresesufekugewoworu.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/mobaxalixana.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718c011b675---76971191394.pdfIn PDF document text
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/xapivizumijukadibaroke.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/fuzovozusawufe.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_off0000d6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDB 10440 bytes
SHA-256: 4717315fa7733ae6e31d761ac9a65de13a39c783f1d23b24873db17253977547
font_02_sfnt_off0001066b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066B 18120 bytes
SHA-256: 258c078d449da67674f3d5e1a90f619180a26b399113a4f4a54ded22c9c91233

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