Malicious PDF — malware analysis report

Static analysis result for SHA-256 c999b38e57b4df3b…

MALICIOUS

PDF

68.1 KB Created: 2021-09-22 14:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 701f5b897596a0df0d9f81cc49d490c5 SHA-1: f87d4ce03540e7c807f71a36b6d898353f152551 SHA-256: c999b38e57b4df3bf356cecd14f237a5c7939bf93f9e384c66d8cf37ffc5f204
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://ticaproduce.com/ckfinder/userfiles/files/rakaregobazolizer.pdf In PDF document text
    • http://kamnitikamini.si/upload/files/vesumaxenidu.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16305193386756.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee9bc6ffea---tazotonoxevopilavozupod.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/34534964631.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614467f9ce8d3---jomemabuw.pdfIn PDF document text
    • https://xn--q3cceuw0c6ab0d2ii.com/upload_file/files/88616038377.pdfIn PDF document text
    • http://csp.hu/editor_up/fafijukusifinenatijotufi.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/ropadal.pdfIn PDF document text
    • http://suurelepa.ee/data/file/8877913435.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/pasexiwukusaj.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/pafagogo.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/55423356337.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/99672028404.pdfIn PDF document text
    • http://briztravel.com/upload/files/deteduwovokoje.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/lisematekumavijogow.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/zarumidizosixewuxubu.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/3ea9e81fb697e33efc8a9cdd5b001efd/bomumevajukoxeforozaf.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/72892937574.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/48019773941.pdfIn PDF document text
    • http://geose.ru/userfiles/file/lemubuzagebom.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/sovilepujedifasosesox.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/26758355898.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/wokuwasapakoruromet.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/14529172537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=torrent+tv+ru+androidPDF 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_off0000af59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF59 14544 bytes
SHA-256: ccd2558ee84d8882a6674e12db759db2cd718738d1ba16cfda9284bf921ab2b6
font_01_sfnt_off0000d422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD422 10156 bytes
SHA-256: 6b9c7db473271c23c0048e38d02b198a5947287e19f94fa13fd45bd942e4423f
font_02_sfnt_off0000eaf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1