Malicious PDF — malware analysis report

Static analysis result for SHA-256 1264e49f26c541c8…

MALICIOUS

PDF

89.8 KB Created: 2021-08-04 11:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1b3973e14147efad5d91818fd0425c91 SHA-1: dcca86700d3ac0804adbd6c35b0ac158f711b73a SHA-256: 1264e49f26c541c8c1d663a1c812c538298bc410bad35417b1b89426eabb8bb3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to lure users to potentially malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ac10e031571---sisuzebilaladane.pdf In PDF document text
    • https://moto-trend.cz/public/files/fck/file/56860206633.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/59252855642.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/4255625518.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610079f5129e4---sodineperogiterevajabulu.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093cb8fe2ddf---72395400601.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/afa3c7b255186c9a25774b9e6dead502/takeb.pdfIn PDF document text
    • https://kildevangen.dk/files/webubovelolerepafoxadu.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/jasefupakiwune.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/65771507391.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/dumefofu.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/zoliguzumopekuto.pdfIn PDF document text
    • http://primaneighbors.com/userimages/gozupegoludip.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/bimepala.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/k3eha2td1jp5hfqmfd9so3ku45/darasepigadukuzofawafa.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/a2277fe9c186317c8351ff737336f116/73275301961.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf99d0230c1---milidifaxedepilubife.pdfIn PDF document text
    • http://bwc.lt/i/97634321209.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021070515091338.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6f256aded---95600367745.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/8c825e2cf41827aae707ec27e77a37be/pezarozurobusuzulotitolij.pdfIn PDF document text
    • https://htddienstverlening.nl/userfiles/file/53046957739.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=are+happy+holiday+barbies+worth+anythingPDF 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_off0000f97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97D 17636 bytes
SHA-256: 0a7a716fb22999963506a08efc898598fe3ce32e1f8be1516256b54c24a58980
font_01_sfnt_off00012790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12790 10992 bytes
SHA-256: 19934d6a104bf80dd421c18d15eead869c0236ada5387255b52a63e1a53050a2
font_02_sfnt_off000140aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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