Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1fcc528e8b87b7…

MALICIOUS

PDF

87.2 KB Created: 2021-07-04 07:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fea0decc51fae5b98b6226da8ccea079 SHA-1: f639b35b68eeff82fc93175952eb9b745c968701 SHA-256: 0f1fcc528e8b87b78dd17e919b56308dfc27230fd8c4cf304782b8193b5826e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The 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 an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF format and the nature of the URLs suggest potential exploitation or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/htbqff2i7pjn99bpjj7djvhvub/zalubidusolorude.pdf In PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9effe7ea4d---tazediri.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/bivuvuxubixu.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/99ad6ef03f120e0fa894264da60397b0/xebasujosufa.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9e300706f---buzuke.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764380366b9---pelokabawexeveputip.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53dcb45148---87353084122.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/wigajosadev.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/jepep.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f377a9d949---11506029711.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/7f3c82a3bd76457b009d4c08b2ed1e89/redawuziwemivi.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/422ed36ebc9f58be7f1bf272dfa1e1ea/2207634431.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce9fe1f8a5---43029345860.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be19c04c98---62824466041.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d2183f1fb---64280130722.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/t6a5bqree51rakmplvi2b5ljo5/rorivoxe.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160abe59e79c4e---puvikegiwupenopuxipikoga.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cdf19fa81---mofumobav.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e90f7b6d0---47063119997.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5ba47a0fd---69379011982.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/2ef804d438f2501f34590b48319da246/ralaxekinawavevetuvo.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/96626971762.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609634f2e5268---4212514287.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/93943639324.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/76863884760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=quran+for+windows+10+free+downloadPDF 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_off0000f18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18C 10668 bytes
SHA-256: 17ac5e66596add306ff136322b3ee39a3e0e503166ae418633e57aa612c5f0ee
font_01_sfnt_off00010a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3C 16848 bytes
SHA-256: 3416cbf426ffcdbba44bd9365c4588c9d0ff3032b15665b21a2b228722a20aaf
font_02_sfnt_off00013579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1