Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b17828a3a2d2577…

MALICIOUS

PDF

86.5 KB Created: 2021-07-31 05:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b58d2cc46fe141dda3be83a548b25561 SHA-1: 87b8d47347f401042656a4e4e068fbf7000f5f15 SHA-256: 4b17828a3a2d2577bf0d57dec7a44b91cb1794583c54f2bdbba82eb2c34a599a
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The document likely serves as a lure to direct users to malicious websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/s9ue4lnboq2od24sf8ohjerejf/divibakalivoligawabibo.pdf In PDF document text
    • http://sartoriaventurini.com/userfiles/files/wurasopitaxirono.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2d93a983f---jikipamupewufopo.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/52135204174.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a739826e273ea1e35eff282b6c1c5d58/mudotikabiramefo.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079fe176abd2---19868419915.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b973187f240369dea8ca10205e93038f/40461011795.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/nosabifuvilenix.pdfIn PDF document text
    • http://sergey-yushkov.com/pict/file/polologunosuluwatopogudi.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/moxubomoledizida.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/in0buqg2ng3gt514qbh620aqas/zujuzarevarot.pdfIn PDF document text
    • http://rilta.net/userfiles/files/29588509708.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/b3c0390047588bc1a70ee5b1328b09c8/47086127380.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/83b93c659a1531f7fd29341cd34d41fe/51184711204.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160adfd3fdf946---jafosevotimemakafiraxe.pdfIn PDF document text
    • https://nomortiga.com/contents//files/61475830316.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16093ce01a1fa3---87205202572.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/34419580752.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/kgpei80kb34hbvo0i9mnpgq4j6/nulamewisiguxosodaj.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/94756102279.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/furivifokexewerabalarig.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f766247041e---banufunaruxivilozojumiw.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/zoginasogomubad.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/9c6d89096c7bcd7b7ec8196f624ac839/kefeziwutunete.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/lojolojasakolabon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=holistic+rubric+templatePDF 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_off0000f09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B1 10664 bytes
SHA-256: 7758fe0b7ccc9f2311553948a9f6dc11ab3c680553ee33aaba34f639c1faa51f
font_02_sfnt_off000120ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EE 16472 bytes
SHA-256: 082679b4b54c3f6d8b7a8f2bb4b0aff73757b6fd8dc2a2a3d16bdf94817f946d