Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c33385040bce9c…

MALICIOUS

PDF

90.5 KB Created: 2021-07-24 09:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9c850f8f1345daa6e4dfd8e778b65984 SHA-1: 09292e74ea869d5b1041dc92407d6ff9e8b9734e SHA-256: d6c33385040bce9ca01dd92ffc21dd628fbc1ef3d002add287752e21f1fe3deb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The presence of external URIs and link farm characteristics strongly supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a2c0ba2ff---sibufofanubema.pdf In PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/62485579208.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/30e1e2cd3ff283f2c0afb28885ac20be/xukabogologo.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/depelemoze.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/fenunopi.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/99434173566.pdfIn PDF document text
    • http://willbramephotography.com/peragetijazejitonibafima.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/pujegawuwanedozobebisomip.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609281ffd1a59---76602369515.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/80efg7t10jm3ahumfd5hs3dol7/39452331951.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a353eb41f96---bujimiwalotevefuvevu.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/82041524690.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/nenewir.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d751e8423efccce689534daaebf25f41/67279332457.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/rudituz.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160861700472a5---49219688435.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94f74af668---44841647330.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fa810af7a---15503060782.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c894ea877b---tifusugojevefekisadilewal.pdfIn PDF document text
    • https://campermagazine.tv/public/file/10225440654.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/nexawapofonopapudugerejob.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b650d259c---pimixeselu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+start+lg+inverter+direct+drive+dishwasherPDF 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_off0000fdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF5 17320 bytes
SHA-256: f260da4deea5cf16ef2a05abc827b08321c53b810ea79ca4f73081b1afd4756e
font_01_sfnt_off00012b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4C 10792 bytes
SHA-256: 1f50aa3d14e0fdc6ceca80ff47b0267d1f8950c7cec45ba362548f1df0b20da5
font_02_sfnt_off000143eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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