Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39a0e15814eecb0…

MALICIOUS

PDF

72.0 KB Created: 2021-09-25 04:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9823b690a224d3171a023a5042c23d66 SHA-1: 5c3a10668e1346b4d4a5efaadc1af1e72362ab27 SHA-256: c39a0e15814eecb01b4586c2d3cdda84a78852195b7b28572a82d27521116781
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external URLs, with several pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the structure and URL analysis suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tuinvandecruys.be/file/31303018611.pdf In PDF document text
    • http://thebankcardservice.com/uploads/files/50504804574.pdfIn PDF document text
    • https://webmenuplus.com/images/file/18983269043.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/4d057b9a17cc33ecb564aadf714ef3c7/14905224369.pdfIn PDF document text
    • http://th-hl.com///upload/files/doduresovevimo.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/68107765202.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/wubuxajexivosebege.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109160459517440.pdfIn PDF document text
    • http://m2m2design.com/userfiles/67514176725.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e438ce95c4---4289698381.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/mufaxixezesafiw.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6132D724EFBC1.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/mibuletomadoxisisedone.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/lesaxuvupapizovubobovur.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/91385789334.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/kivamibazewi.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/zerefona.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/62771536340.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161491792cc160---32418610626.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/nijiliduko.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/gugapopekiwifegoliwid.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/nowowuwokemuzi.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/89083735843.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/digonugupemimu.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/11874152705.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/cbc732c4b0dafb8925e267087552d76c/nekekedikofujix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pencuri+movie+mael+toteyPDF 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_off0000b600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB600 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE12 17324 bytes
SHA-256: dd081a2fc9bff81c92603a4af2fc1fd102509e5a07743d32f1763a79051789eb
font_02_sfnt_off0000fa24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA24 10504 bytes
SHA-256: 0e0d3a92237af379d6e03ad555884dc7fab52a0bcdb655b61edde2636136e91b

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