Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b4625bad285bb4…

MALICIOUS

PDF

87.9 KB Created: 2021-09-06 08:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 153cf7b1ca60da0a7901a5c201a8dbbb SHA-1: ea657bf62be9f12b8b44bfd4ea38fb5b51fec33c SHA-256: 59b4625bad285bb48dc9a6247149dcc9186dcaa93a2078e00811aaeff94a9a82
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains a large number of external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious destinations. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://catamma.ru/uplcv?utm_term=corsair+h110i+gtx+manual+pdf PDF link annotation
    • http://youngshiny.com/userfiles/file/1628677592.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210810_085910.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a1832005---monepufotas.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/6e00bfb8e9f076ea8915cbb4780fb357/sulekogozu.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/45236873254.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/susizuwoxegemadenujerodig.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/99482135327.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/86495373038.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/256f550974bb0047d90aa4fe1bd43731/32738344467.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d819a32e6f---98245470455.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/66476938709.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/1efddbf33aa75b4eec785e705f95b095/vomox.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/36039675526.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/53940517428.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/29311588067.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/5785be59056f221a0b0f1d2159301036/49729259472.pdfIn PDF document text
    • http://standardamulet.com/files/files/guxilabujezonidem.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/wisugividemalagifawoz.pdfIn PDF document text
    • http://julianina.de/upload/file/54892548671.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/92543152193.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/ocua824ime1gaokpj3qrg40lvd/kivexixoponasat.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9cc272cdd---jegisamukoburotipuwelixu.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f7e29f154---20150089384.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_off0000ee3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3E 19024 bytes
SHA-256: 816eb82aa90d0929cb27c9849e8a4fee719de1b085b5519d700098f5ebcface5
font_01_sfnt_off0001204f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13866 11220 bytes
SHA-256: 5ac1e85b12d99e7ac5642dff10b5b8b84874d96f580ec676f14377497223a692

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