Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d7497b21b65a724…

MALICIOUS

PDF

72.7 KB Created: 2021-09-08 11:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fac1e198dccae9f19604099f0972d86b SHA-1: 4eaeaf47f7ce67258cd1c1a6d6e78b7098e3a7a6 SHA-256: 3d7497b21b65a724b7c9f96a8af2fc11c84e27ac9b69a9fb6ecb34c3d209d238
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing pages or further malware downloads. The presence of external URI heuristics and link farm detection rules supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://oniceh.ru/uplcv?utm_term=peter+pan+francais+pdf PDF link annotation
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/c4f5af67ad9f0ed1881aae23a4d829a7/41144516164.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/12780569355.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0aa2c3e1bc---44011930002.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/talujuvolinakomovof.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/45108317034.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c2638cb9e88d51065c965684e801a1c3/rivutiruporilunijigokiw.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/d9ae50dec41e9e97761e7a7a440e7f93/vadokegodonegil.pdfIn PDF document text
    • https://buka.ru/sadm_files/77649195800.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/dimakitebefobis.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d9491ff10---96487835716.pdfIn PDF document text
    • http://flexa.cz/docs/file/zojaxuresago.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/faf1s6l2frbq8l5100nc69pa09/20308731889.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16129bc8594622---jibaboxojabozokizexax.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/66213581759.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/vutemuwofanepopatezukuva.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kazopurulolivobuk.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/gopomefegorotefusededud.pdfIn PDF document text
    • https://akemi.ro/hirek/file/tixirazujifevuvofatuvan.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/vinobiguxisikeni.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/3594148561.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835f2f8feeb---vufapaj.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/36436154897.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_off0000bba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B2 16052 bytes
SHA-256: c43738dddf5792e7548526ec2f65943c4fff242e63fcc709aa8aa3fda3901398
font_02_sfnt_off0000fd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 10448 bytes
SHA-256: d7f910180e165e354d3c9003570e57b0b133f7683e5872c087893eb06cb0345d

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