Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85bbd8d71742cf1…

MALICIOUS

PDF

132.8 KB Created: 2021-07-13 17:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 238946557c8b73f0ef7a84a334828de9 SHA-1: ed38dd941ffc785250eeff3c1ce7a92dfd920a93 SHA-256: c85bbd8d71742cf10d956b9f18192317a26718c92fe7c2b322480b8d5efcbd55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for phishing or malware. The presence of numerous unknown URLs suggests a broad attempt to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9723

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://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/b8f1f8321a7930ef3e7713e73b5db4c2/32554700786.pdf In PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607534656fd66---tenurepefonidawuxelewanag.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/xilasijodukexavat.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/21831972523.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/9dd1e634f3d6629deedac60d965ffd11/pekiwawiwimituvapejo.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ec77ac1a---60727405072.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb5fb4d2aa---30809991767.pdfIn PDF document text
    • http://texmet.pl/userimages/file/nuwejanewekutumunesarojiv.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/kulejopowekejoku.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/niruxupelujopusewenaka.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/58465468529.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/witavupoxogalujubefik.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/36093945248.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/73561120472.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/14c374d520de8e76d04f5ae0edd0ece0/86866159603.pdfIn PDF document text
    • http://wearebryants.com/clients/3/3b/3bb22ab34fb8fe691aabc4d0498f9caa/File/58512052365.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160718f8b1f121---22970569948.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/qc5l07oifq15ffenmkevriok4d/rosib.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915afb817c0---fidomusasoxafojolimek.pdfIn PDF document text
    • http://bwc.lt/i/bojijo.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160877863c2164---72474348108.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/xukidejep.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072c6cf2990e---rekukukisaxezufanujibanaf.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/kimql2nln83tu179ddlopd6pq5/giselijodisagufob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+old+is+kong+in+godzilla+vs+kongPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000181f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A07 10388 bytes
SHA-256: 5c30a36029d04a61460f5fd1d978f46e96cf98bb099f9b996ffdbc776cd422f7
font_02_sfnt_off0001b15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B15E 10716 bytes
SHA-256: 66d8e035b184eec597176aba504b9736a0c96a8448cd34719260773c5b1492c7
font_03_sfnt_off0001d376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D376 18760 bytes
SHA-256: bd990995dbece53e9483eb0d161aa3c857ba6049b613186195842178767d0dac

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