Malicious PDF — malware analysis report

Static analysis result for SHA-256 87632ffab8908067…

MALICIOUS

PDF

73.7 KB Created: 2021-06-18 06:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 7769e0d513dfe87395b1b033b9fc871a SHA-1: 15d9ae774f6a2575746ce6dd6836f696989ce2d2 SHA-256: 87632ffab890806732741acc4a0de4fb1c93fd193df007853de938f734d72eba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malware distribution lure. It contains numerous links to compromised websites, specifically leveraging WordPress formcraft plugin upload directories, suggesting an attempt to host malicious files. The PDF structure and embedded links point towards exploitation of client execution vulnerabilities and potentially JavaScript for further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://waelfawzy.com/userfiles/file/ In PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160788b50cda56---57649313684.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4f38dba59---41131686929.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887db38e95e---vuligobufededoseb.pdfIn PDF document text
    • https://aashianarealty.com/file/kosowaveweba.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/zaxunotexa.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/18024554928.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609993f1c3c8b---mataxilivikuzoxerafazo.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210509051823.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210617220318.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c78b94654---livijuxekafegijusebuve.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd9324a8b4---jevawowa.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/jumezom.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3ae106e85---sokiwib.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160aa87ff6abe6---fagizobomovawuzunog.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/7546ef7dc1ee2f71678144de86937e3a/78346507871.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=dnd+book+of+ancient+secretsPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A9 5188 bytes
SHA-256: cdb7dbaa1e117560fd032a583677b76a3db52b73cd5ad2c110b6b72e11539470
font_01_sfnt_off0000f760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 10168 bytes
SHA-256: f998c58f86085d5bc0d9899e484af4c861cc7d39cd51560b5a0a4ed7b68a3efe