Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c5dd7e84bc42e9…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 00:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5000c36aeb941f22346e266c5142ad93 SHA-1: 6f7c5a31682469bdd584d9c91ce71a8b2531f508 SHA-256: 61c5dd7e84bc42e9652b8cae1e7ff8dffdf1edd52d40c0bd9ace289dcc3d15c8
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of link farms on disposable hosting. The primary function appears to be directing users to malicious external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://wastran.ru/uplcv?utm_term=cherokee+paul+mcdonald+a+view+from+the+bridge+pdf PDF link annotation
    • http://greenworx.eu/images/uploads/files/jefafezigidalukubovexi.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/tbmku4mep3fe3osdcu21026fb6/rumuxobapudape.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/15087992284.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/72178621070.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/1696949123.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/fuketetajotesedefolujab.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9d323c02f---51200730195.pdfIn PDF document text
    • http://delve-cr.com/uploads/pejorojijutaruxapa.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64b4e2a64f---mupirifa.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/81341520190.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a417e346fe---gipemumogifijoxabobemorif.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/lotefatodavokazame.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/lavivexugawe.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/2184406072.pdfIn PDF document text
    • http://15881588.com/ckupload/files/67518565063.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a40a392d00---91418382201.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/55555313291.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/9215854543.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d9acc91a9bf---54202392458.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c652d21486a---57465898803.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/94811569353.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee0d267e6e---95998591990.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_off0000d638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD638 11412 bytes
SHA-256: 6089c22ea3c433755ec4d054ab6cb9a1cb6c0b836557b6ba35135dbb8e1f40a9
font_01_sfnt_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 17436 bytes
SHA-256: f167351d4af6361f209a12662f131aedfa136d71ec0820a052512c269662bf83
font_02_sfnt_off00011d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1