Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e7d5bf3032dc15…

MALICIOUS

PDF

84.6 KB Created: 2021-09-11 17:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0d90c2d5af1f906acf45758c9a3779d6 SHA-1: f35244e38c958c9ee01df1f893ea23730d87a728 SHA-256: 77e7d5bf3032dc15e93061367f7650e6e8cd4ab41b63755a5236342f6a6302ed
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics and link farm indicators supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=music+%26+audio+download PDF link annotation
    • http://inhome360.ru/admin/ckfinder/userfiles/files/96198946145.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/70079296994.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0b4i95niitpdetk2urp946vnk3/70439409762.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/mananirulawaxu.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/nivexale.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/50555336106.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/84810814126.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/131bdaeb201baa37be9229c3e9553cbd/5588616849.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/toxosajisukub.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/32620228067.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/8550777497.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/3df365c14d28fcbae7024809e3b5412a/zuxoxomepilokifidolazer.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pva8bo6vhmoa82dha7jd8ecv26/furexoropulefavu.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/fugezewefexokufivudiroka.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/31409701748.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kuxel.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/22050532851.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/misafexumenanasose.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c7f30ee30---femapuxikiko.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/winigemulotexukoxogatik.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/94602723529.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/zexunalosifamamugis.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/wolaf.pdfIn PDF document text
    • https://ahha.az/userfiles/file/3722419191.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_off0000e890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE890 18604 bytes
SHA-256: cf7c03119fc85995c7e4cc3e08c4c55710199b9371b13f378f22d6c975d92af3
font_01_sfnt_off0001182e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182E 9548 bytes
SHA-256: c96bb84fbac14cf09143038924798a7f6bbb74186765245154c84e6285866f05
font_02_sfnt_off00012cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1