Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5660985fa19cdc4…

MALICIOUS

PDF

80.0 KB Created: 2021-06-25 19:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f7673c88034d8a8e147c3abe883b882a SHA-1: 585cf16138b45e1a3bf22286e2309c9eed09f044 SHA-256: d5660985fa19cdc478b45099b6ca956daae6e9a422b1138136d23f73cdf3b4aa
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://coretry.ru/uplcv?utm_term=1kg+in+pounds+and+ounces PDF link annotation
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b02eada37b---muxemewawuf.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/gofusomisemalatal.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc85a527d6---65701903572.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba83dcd952d---kibopep.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608184e629dae---lujizajesigerok.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608482e79171b---30871555095.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/444f5250ce7beb2c8525ea988b798728/dazava.pdfIn PDF document text
    • http://compsult.net/userfiles/file/voliluvumefalo.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/90221089931.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/3e0f59c88b68d433e87db7385ce74bc0/28838430299.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/44048812026.pdfIn PDF document text
    • https://moolans.com/uploads/files/6087021810.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/gupegazuvepi.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///43636953456.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/1246725176.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa25e52d35---50641651399.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/vakefaziliw.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb1fe2163e---ruxulijomab.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/pipoluzikolikabed.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfdfda95eb---1435707444.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/sigegarutodoxokoge.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/0141ba74789f9850459ff501bbe69d61/zakivadexedesuboxazubemen.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/vojitaxukiwenerevibi.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/9fce7ef87df6e30505a8c136f6aa2bd4/taxabumagupaf.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_off0000d768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD768 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 16776 bytes
SHA-256: 74f5710d8e625c5cb6a2c8a0e1b861268df7fe95835418788dc8751b9e2e62f7
font_02_sfnt_off00011af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF8 10592 bytes
SHA-256: 02dc199b13e64a95c4dca1639508a13bc5ab841dbb900c1ca04004d563533948

Open this report in the interactive analyzer, or submit your own file for analysis.