Malicious PDF — malware analysis report

Static analysis result for SHA-256 848f7a2771f36b8a…

MALICIOUS

PDF

106.0 KB Created: 2021-09-21 09:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2fab2011b52d135fb1855654c7fcfee9 SHA-1: 83fdfcc95dc833934f26c090788f5d3072568dc1 SHA-256: 848f7a2771f36b8a59b79c5eb3526225a17765738dd4cc772ec34ea43f10520e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or appear to be disposable. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for potentially malicious purposes, such as phishing or distributing further malware. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://nomylo.ru/uplcv?utm_term=sword+art+online+season+2+ep+1+eng+dub PDF link annotation
    • http://gamebonda.com/ckupload/files/12857130116.pdfIn PDF document text
    • https://tkbhanna.com/ckfinder/userfiles/files/91755431624.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614912fecf227---janepivowatosepab.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/76647170411.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/87413552567.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/nuzipatefajasafowutixafo.pdfIn PDF document text
    • http://artospace.com/pics/file/naxonofabanujabidoxumadi.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/47bd43631cef1f0fcb109abe6294f455/lafusegejesexi.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/naputaxusekizowar.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/1647066412.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/kijepuke.pdfIn PDF document text
    • http://cecev.com/stockages/files/14510362560.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/foxadapopese.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2ld1o7tt867ulcb5g4jlf5e1f6/64169559641.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/e22c4c9ced3c845dd8f8f9ab3e5af26a/bitogimanama.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/49044045505.pdfIn PDF document text
    • http://3q1p.com/upload/file/210920171039279002xobt6vl7fuyc.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/12485957233.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161491fc23df7d---27771416347.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/68282539456.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/68652311708.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/90544849522.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/dimesuz.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/tinalutifusiwivef.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf6041aa36---marutalira.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001142e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142E 24040 bytes
SHA-256: 31c3a2c68d81c689ad76d11f0cdf44ce6110666ca53573342bbd2fe3e623b2f2
font_01_sfnt_off000151d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151D2 16192 bytes
SHA-256: 126aabc53b187bc4421529373f04e2f66a11804dfeaeb35cb650b132d56c1dbd
font_02_sfnt_off0001677c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1677C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F93 11140 bytes
SHA-256: 9890e3f7419c7ce07047e9d035d452ac692c9bee77d7cdc6547c712e2837e565

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