Malicious PDF — malware analysis report

Static analysis result for SHA-256 26333ffb5f1f13f8…

MALICIOUS

PDF

73.9 KB Created: 2021-09-04 03:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 246e230ab258e7c8e4a880a17625fcff SHA-1: 6eefc91a0f20e897445aaf732e1023590fbd1212 SHA-256: 26333ffb5f1f13f89d113e272ba3507d55d48438d6f86c2059134896e444def9
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised or disposable domains, likely intended to lure users to malicious sites. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://j-kowalewski.pl/uploads/userfiles/files/59716514646.pdf In PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/koiu9hiv0r5c3rrbkntq1cquq2/nerokoziwed.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/10302774155.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/bde70fd85d7145c24b323796850d5d38/gerijemibujixexobezesovab.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/fogagules.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611087edbe586---64467086934.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/60890026417.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c83cbe5c4---70484570918.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/h00dbdlefmnp952556t47tcei9/paxanivapejegedavonoguna.pdfIn PDF document text
    • http://asfalon.com/__files/file/vilabefezidijipisemadez.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/21081510522482002010v5g.pdfIn PDF document text
    • http://apvn.info/userfiles/file/texuturivutebaga.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/goguvojezafutitukobana.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/36882446861.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/53c457f1e760fe653e98928fbaef3cc8/gomifaraxelalokojizekas.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/65666608172.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b93c3e206a---31968743683.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/4e95kls9qudp33uliunelhvsvm/desizesoxiduxavugugib.pdfIn PDF document text
    • http://oris-am.com/editor_up/nuzigulofatamipupamo.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/872a8822c6bd1e14172154bf04f48086/90804397433.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160946c5a7a5d4---xawedomofilumopakow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ford+edge+repair+manual+online+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_off0000bfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBD 10652 bytes
SHA-256: 134a6f0f90d8722695ed47fc63d308668ee4032c11b53070deb2d77ab2ecc7fb
font_01_sfnt_off0000d7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C6 16336 bytes
SHA-256: 8e254e676d4f5b57e1b3aea5013e59b7c20bebb6b01bc99d62b1a3740e02ed35
font_02_sfnt_off000101c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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