Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ad1123ad3adc9b…

MALICIOUS

PDF

84.1 KB Created: 2021-06-10 06:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 657204897f52b953f785171ed33d8520 SHA-1: 68edd590b86a73954a93bbebbe640d7a4f63eada SHA-256: 73ad1123ad3adc9bffc41fe14c91a3ddc2540bdecd72e2abbef516526e8268a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document exhibits characteristics of a phishing lure, presenting a fake download button and embedding numerous links to compromised websites, some of which are hosted on disposable domains. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan. The embedded URLs likely lead to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=gta+v+skip+human+verification PDF link annotation
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/3p5mnqedrkb0tj7nni1uqbeebj/lufemofarefasaso.pdfIn PDF document text
    • https://zahnersatz.pl/userfiles/files/kamupijapikoxesobutozolu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/iugh5ol2qr66hrhp6mm2rh8d5u/26684178444.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/f1f7b918bc52c8d66317aa2599e660d2/milupilujuzumofajute.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/sql2usl8f78gulaibtqapp8on4/wavuwerugat.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/laduwusezijowux.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3dd292b706d3a913de1ef4a5ae544bc2/nesepopimawojemajogin.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079246a94dfe---wabugozejufodoro.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/pipotulaxodilisijose.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16075008cc318b---62480905802.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/1d3db0c978662c1a4a6c829553c4045f/jirat.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088bf4a90c71---29567119968.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160837841d316b---64003887168.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/3057ac45371212c304d2d6b7c6716505/giguwulubat.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075939a74e17---43477896632.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/86737433256.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071461d95eba---98508587117.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000f25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25B 5380 bytes
SHA-256: 4b52198472e53fa15d257a6d2057d0faf1dccda9bce3d43a9d2d12c3e9bdc5c5
font_01_sfnt_off0001048f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048F 10632 bytes
SHA-256: fdf8bb3082ee5adcdd1e4df71f2becc2a7e320c9d6ff0e2a140c8c10bc09190b
font_02_sfnt_off000128f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F3 17112 bytes
SHA-256: f9dc15b9e7e1a45eeec377706f6e9859ce73b6054018bdf95ecdbdcfaa16ab0e

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