Malicious PDF — malware analysis report

Static analysis result for SHA-256 626ec58e7d86b1b4…

MALICIOUS

PDF

90.4 KB Created: 2021-07-26 21:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2a5c03aaf13202dcf8a138baa08f5c06 SHA-1: 593dea9a9e0d906a574b30ec49a9e53bc641a90d SHA-256: 626ec58e7d86b1b487312df0cca78555312a292a24949426d7485e0abbb1c533
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to various domains, including those hosted on compromised CMS platforms and disposable hosting. The presence of a 'download button' heuristic further suggests a lure to entice users to click on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://shimoltd.ru/images/file/karok.pdf In PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc29e6b71c---71896230056.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/27503554714.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/80100182388.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/luwavamexezaxa.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/82159879112.pdfIn PDF document text
    • http://learningkey.org/userfiles/4729456031.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/nikefonege.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/ifl5v7q57jpo0104a6u5kvb7l4/vivopabofanumefowewuseb.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d707cebaec3---gisumi.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/p80m7uf6l4fjlp6j63ff3tpf33/tekufodowuse.pdfIn PDF document text
    • http://quaint-house.com/vuwut.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/jubotopijuvixozerawokobol.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b9c8c0810---97897720680.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/0jp2lt9lt5kfh7br2usn2fefas/kuzatejedo.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c04b4ce9d2---suzose.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/39801209316.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/66169635831.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fbc6edf1c---pezikeboniwefumo.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/50ded78f49a0ff732e62f8398fe971ae/89241727650.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/40889050413.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/besigezipuma.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/77c0cad7ee043fed4839517b29af5ade/duwunajetefofiwopufulapu.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/14893828248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=sample+of+resignation+letter+from+cooperative+societyPDF 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_off0000fbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E6 11076 bytes
SHA-256: 96e8dbbd4db032b985be3e5b458dc47e35716463768f63d64034b299c17bb729
font_02_sfnt_off00012dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBA 17680 bytes
SHA-256: 9b4786e926235e99d1b7f26a6fbe9bb00b8d6a498ba911b180867e509374f3bf

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