Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e21c55be9b885e…

MALICIOUS

PDF

79.6 KB Created: 2021-09-01 22:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ec78d4cd67b08d8b8b89f8e69935ea7a SHA-1: de660a5f12400fd93b200388bb55f3f14b07e9cb SHA-256: c3e21c55be9b885ed39f1a7c960b34c033ad2ef891950aac6ec6fb789bfa41c4
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://agentcctv.com/userfiles/file/monatozuk.pdf In PDF document text
    • http://restauraceeverest.cz/userfiles/file/xixil.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/b5c87f010f14747a40a394ac73ee7e1d/witabopigoped.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/76433419507.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/d87473ee3da1b822796ddcc3dea17952/74635320329.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/zixofo.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/11039202351.pdfIn PDF document text
    • http://cycling-software.com/files/file/74358007175.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/viph5roolc6o4u9oen7cr83n57/20918100858.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/pegufomibakafus.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/muzuwolawisazegowo.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/988148e5f6accf35423344498ff30eff/19832354142.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202107090750163432.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/81378143784.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/4fecc53c38b18f9100a4f66d795e5bb4/kiririrafe.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/4v3dg3na23gp1vdfvoh7bc2tl4/jemuligijit.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/vefufaroxupepurekagugawa.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/turuki.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/pilokotus.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/e32c5c09efe9350022d85b72a6c3feb1/vines.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/4bd52f24809ca9614e5f7eec331b5754/sadelasezimodajaz.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/rawiv.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/97925572620.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098d68560349---96324145669.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09a6d51b56---lovinivogogalumovamuvizoz.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/64142469313.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/kexopotelopopugisej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=841+bus+timetablePDF 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_off0000d1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B0 10428 bytes
SHA-256: af3e17d23ee518618d668ae18881c33b58ba09cafd93449326236f6de378a5cf
font_01_sfnt_off0000e96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96D 18076 bytes
SHA-256: 0703aab0cc62d2eb45a534835d125e0975ba9435ea38efda3ded35ae0c38ea76
font_02_sfnt_off00011879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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