Malicious PDF — malware analysis report

Static analysis result for SHA-256 59bfde53deb82bed…

MALICIOUS

PDF

79.6 KB Created: 2021-09-01 01:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 26294e8d1c34a9b982bff7a9afe24243 SHA-1: ab2617736b316b50e1af0481cd174a9534f8467b SHA-256: 59bfde53deb82bed892a6a277852b1b63dcf69475de0dea820670339f1b5aea7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/2b4290c008f84f717fc6364a01654772/43739477354.pdf In PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160815d09aae47---78710582333.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/fivupe.pdfIn PDF document text
    • https://noddy.nu/images/file/ziwibi.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/gigonelobopibalukezed.pdfIn PDF document text
    • http://vicorsupply.com/uploads/images//files/78480339077.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc53fefc3c---73372841271.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/8b6d208202b09573c91866ace51bf9c6/lojijelizowa.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a02598cd85---61894393239.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/43080689017.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/43e5d5f1e34a94124d229af20d4112e4/50039436954.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1610deca79264f---96705311242.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/puxafaw.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210813_087833DB152F6248.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/1d40267bd0966a3b7e45271a4f9b87a7/getuxewurugi.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/11b9ed6ed958f56a5fbd9f69ff9886c6/dutekizudavesefox.pdfIn PDF document text
    • https://zlataraburmevuckovic.com//files/jazemifosutawofiterukize.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acad7f3cfe1---zepiwanomepekazoxegojo.pdfIn PDF document text
    • https://iohrp.org/f_files/files/letujoxam.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/37979317941.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/44204849471.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6470b8f19---5738772265.pdfIn PDF document text
    • http://sgpeo.pl/users//file/buzegisunivipesezefe.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/dc7074c656d4306bcd408fc8624474c8/12194316310.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/fepimeka.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/10f59276e819b2a9e95269a52b03fb81/70157982364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=download+bad+boy+for+life+full+moviePDF 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_off0000d088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD088 17976 bytes
SHA-256: 05b03d4f47eb57ddba9915436c01f56f630e1785dfcb9548ce216fa7997c9047
font_01_sfnt_off0000ff1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1E 10756 bytes
SHA-256: d82bb4e4cf1e36dcca553638026aefd7b144058f226026364338dbd8c7bfadca
font_02_sfnt_off000117e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1