Malicious PDF — malware analysis report

Static analysis result for SHA-256 efea0b9fe3399c01…

MALICIOUS

PDF

73.2 KB Created: 2021-09-28 12:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f9ae0e0d874ee2b05c3f9dfe1c824987 SHA-1: 1795b9942137973e3e2f62941328d99cb05ec0d1 SHA-256: efea0b9fe3399c017eaaab9b1c3716640edd4208948abccbc881415e292691a6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67076484444.pdf In PDF document text
    • http://eventclub.pl/userfiles/file/52936504925.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/luxufufasovixutoriti.pdfIn PDF document text
    • http://vodnik48.ru/content/file/61344485228.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/74889657970.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/56754200524.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/jijipi.pdfIn PDF document text
    • http://irinabailey.com/upload/files/29389917293.pdfIn PDF document text
    • https://zzwgjx.com/d/files/rufuwupixumipozaduw.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/95005336782.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/34440804351.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/gitepirubopulagago.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16147126157a9e---dofopizidanomafag.pdfIn PDF document text
    • http://annabarons.lv/files/files/wapevidumef.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/60313186251.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/48937424737.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/xotunowon.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/48f3074f0f200e36aedf093abbb915d9/2928139940.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/toperupu.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/pesifuvej.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161449325e69e4---13423798583.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/39566547510.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/7375902650.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/41028792179.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/jobovikofuj.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/82affda9d46296353d6a2dd6049101ec/57896095828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=freeflix+premium+apkPDF 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_off0000b8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BA 10300 bytes
SHA-256: acb49cdacfe34d5629a310fc82a3b3dc01213601ce78a6e2aab6644b0b470d25
font_01_sfnt_off0000cfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F4 18544 bytes
SHA-256: 43594def55fa48e4444b3b3e4d2eaeed95f43e403b8fca17e97e254a2a23b4a9