Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cff42e266091e2b…

MALICIOUS

PDF

74.6 KB Created: 2021-10-18 20:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 11ac48c2edee2b5e15aeb8cd599de494 SHA-1: b10891023a6e402f3950f1538ecb68d74491a1c9 SHA-256: 3cff42e266091e2bbfc81a2d49d2bbd5273e8110e671a85476b08861d2519df5
164 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and a large number of external links, many pointing to compromised or disposable domains. This suggests the file is designed to redirect users to malicious websites, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=department+of+health+abn PDF link annotation
    • https://angkorphotographyguide.com/userfiles/file/norubisovuvetikido.pdfIn PDF document text
    • http://ashioke.com/images/library/File/gifawobovinusubixojew.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/13645667948.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/31259218795.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/10520945331.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2109250330416138759slh56.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/18619270976.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/17990831441.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/c231f553c66f4471995bcb874343d3fd/8371071047.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/95838049351.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/jabupijutetoxa.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/46775890598.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091220305591.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/40692368584.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/kebexixow.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616c97a5504a2---gasuzobejoj.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/47112461707.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/71006331526.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/wawowalobe.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1615bed14f2af3---14063441962.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/54904945267.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/lotofudivesexaxov.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/zinoturub.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/2bf1c5ff60993ae74f69e53d9db67c80.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_off0000c1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA02 10504 bytes
SHA-256: b5b750931c45b34317e2279fe746fa09d88653ef8a9dd6b30e590536c3fa0163
font_02_sfnt_off0000f176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 16920 bytes
SHA-256: ebb587ccec8076785f1efc2fed6e94f809ec484fbe737cacc043fbc7a9dafdba

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