Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1afc93cbb4c30f…

MALICIOUS

PDF

83.7 KB Created: 2021-09-08 01:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff7caea150b2c7213ede2ba4d142acf0 SHA-1: 6ebad2c219b1cf8cea7ef77ee9dd988ec01bcb2a SHA-256: fc1afc93cbb4c30f1fe1d2218b333a320ec849528fbb722199b7ad870e7c63f2
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure indicate an attempt to lead the user to a compromised resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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 http://officeharbor.com/pdtInfo/44110819575.pdf In PDF document text
    • http://renovator.cz/files/file/7811320978.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075bf3a9c57c---vasilimilizisa.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/70337807590.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/3fkr5f6sbdbngirhl3d5quaph5/xirimaxenalatata.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/46367462531.pdfIn PDF document text
    • http://gloria-eurex.com/vudezenijobodoko.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/41055138708.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/uhas4pune3ib6pbsnmnfiifr15/62144153773.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/wezapijexat.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bacec6f2ca---pajat.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/2425281999.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/flsvd5t5q0nlo1g2484g9bs1gd/48002440781.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/tanusijaj.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/kezemagosavigerobo.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/73338508261.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dc9f7435d85---86206213644.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb016ac8d3---rezepogajitadomuv.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/74139576977.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/fabiketaragafuvusu.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/92512184068.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/mivupaz.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/02de939ac0c28405665bb5d64aff3fe0/vedowubagana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=call+sign+chaos+learning+to+lead+pdf+freePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE051 10932 bytes
SHA-256: 17975ba0b334bcb64aa511ce425d5d91b1291f22b16be4eb9a0d17583c094c18
font_01_sfnt_off0000f966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF966 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11178 17700 bytes
SHA-256: dd4bb927282d0028a6ca6e0bc7363d2ea7872a462fbbb41c70165369cec05b29

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