Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e777de7e4ff654…

MALICIOUS

PDF

99.1 KB Created: 2021-06-28 01:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 3d7b26578de151457f8a62b0083823e8 SHA-1: 6ae8d8a2ca13938053225743cd8af5fe515dc1a5 SHA-256: c6e777de7e4ff654884949fbdd6c9a062eee5881bf5c95bcb4c79a3c98a74bac
184 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external links, many hosted on compromised WordPress sites or disposable domains, suggests a phishing or malware distribution campaign. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 https://synerhu.ru/uplcv?utm_term=financial+accounting+1+past+exam+papers+and+answers PDF link annotation
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/hfab7cbpuvlieip6o8sv7b06a5/62830901178.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/02e104335a24973305efd196c1b51325/feregirane.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/nkb697kvjt4b6v8fcd5r49hfn1/luvapexiwozegitisifadom.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/54151906617.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974e4b8ebb1---kuvogigizaluzovo.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ca3265f0a---94537432682.pdfIn PDF document text
    • http://camwater.org/media/files/23640467422.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bee93074a5e---losutojimekonarinobupiriw.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/7634ca4c66a9706177bd3a61d66c3c3f/jipedisazirom.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba12407ea45---letizipowexi.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/vewovugibepifejabajipum.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/17343b241b8f58802783893847d55632/10903702609.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/vegezipifuxinisas.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021062303125970554.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/16256162816.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a62ffa1b291---12779670847.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f0f1e71c6---34104998636.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/tuvanur.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/38286339340.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/b507d1372529c992b2be3ef0f3b22ee0/xesupisokofiju.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/21ddv9697vcvh8ch09qqsabcb4/diretupegesakakodagobi.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908814ad3bd---97054279382.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/1dde0b44e42f14401ca09653ea6cf678/reziraxilejakenudemupe.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ed418fa2d---lemewumo.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_off00011ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACE 18828 bytes
SHA-256: a38a5beebd50932f019210d96d35b34d91891ab756d7522d9a72a40f34159b6c
font_01_sfnt_off00014cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC1 11172 bytes
SHA-256: 6c1f3e8d7291523b313e34c7c55b4264e04828cfdb2b3fb1b5445e3533562875
font_02_sfnt_off000166cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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