Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f378d2dc8689be…

MALICIOUS

PDF

118.4 KB Created: 2021-09-06 23:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7ed2a5a1bd753613356b6a265fee53c SHA-1: 8ec289849ce16e3cf5e1d80e5d5deec514799f3b SHA-256: c3f378d2dc8689beae94296c872fd0e1ca4a65e31751b4f74fef725022be644e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external sites, which is a common tactic for phishing or malware distribution. No scripts were extracted, but the presence of many external links suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://synerhu.ru/uplcv?utm_term=define+conceptual+model+pdf PDF link annotation
    • https://motelandratecuci.ro/userfiles/file/jatan.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/766d2c0c428e27e5ce4e796ce040b8ab/84170671433.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/bijozesokaniraputemoxi.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/3495acf72937e4c7b569b7d7687c8f71/86746622770.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161250908cd23a---xepulinagejagedemig.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/95195804275.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16100e0fdcdee2---89654641002.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/lexewiboxo.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b011093e122---99638211634.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/976b4f7fe2152b5cb3353383348d384b/kukenuzisidi.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610c8789b1f0f---25679994073.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///jefuxiwabolutijeg.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/a0541fb47446f4dc68b3820e01bea832/betusawofa.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/91378004383.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/jujefowesafesamolidu.pdfIn PDF document text
    • http://platcometals.com/images/file/bawekurubonelofituti.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0fb504111---14646527469.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/2366776f6ad4b8ab04bc37179d0e2ea7/totitosajid.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/11745363874.pdfIn PDF document text
    • http://df-2.de/images/daten/file/lisoxonuwefejariregejewu.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d4db324c6cd4f8153c81e12489faaad5/putonelefijukalaxipoput.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_off00017076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18888 16752 bytes
SHA-256: 661cdc465005eae3c051fd28a2690f518feb0aaf017b2a5791c793cbd1fde872
font_02_sfnt_off0001b39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B39B 10616 bytes
SHA-256: d37d8475bcec891fa802e28f91719015032c5535fa2ef7ed477dfc2f36c6df03

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