Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cc135855fb743bd…

MALICIOUS

PDF

86.2 KB Created: 2021-09-17 14:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 472056a89358f90b7b1f1ffea1fcbc45 SHA-1: fe3e8cca0a39cd1c71571599445875515ad61dbe SHA-256: 2cc135855fb743bd517a1b95576aa9ff60a6a94f1f0287533394f706e0db344f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as containing a link farm and being a potential phishing or malicious document. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of numerous external URIs, some pointing to compromised CMS uploads, suggests a phishing or SEO spamming attack pattern. No scripts were extracted, but the PDF structure itself is used to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/gdq8ij7gc1e6pifmvun9insja7/pukovusexepo.pdf In PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/17/situtaz.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/98371742586.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/96909143969.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/77266882452.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/sagititegivugomijijewip.pdfIn PDF document text
    • https://ambalatender.com/upload/files/loraxiwogivawazosisawu.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/14673197424.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130212196676---57731945933.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/80277001562.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/boogln1adr09gi335olvh72ue3/48576075034.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/85929908433.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/36a6fa4a8180e2bbbab028e6e134e4df/28029814503.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4325d5e75---fosaxuporoguwejir.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/jexezosonalebosem.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/tedotekagevenowuzif.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/h3lo3895vito4l0rhmhghpp9nb/tiwibuniwepegixotasix.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/giloxezuzomajesoga.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/69496893823.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/28885797898.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebddb473ce---murusunukusenod.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367a350ce63---rulin.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/61848525582.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bf90312a9---zowokagufarusovufo.pdfIn PDF document text
    • http://metabolit.ru/files/file/68331404453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+recover+deleted+photos+from+sd+card+in+mobilePDF 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_off0000eb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB68 17904 bytes
SHA-256: 3ada2ba6b54c35bc2716922ac979b5e595944f9e91c501c439cb15fd5241c531
font_01_sfnt_off0001191b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13132 11168 bytes
SHA-256: 2f9298d9a225cfbb160b223e7059d7caae3f81fbdb92e053d88fa5d3a1a2760f

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