Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b9808ebbfd0519…

MALICIOUS

PDF

91.6 KB Created: 2021-09-08 16:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b7b79dd5a1eb781cfea4093204a4e0a8 SHA-1: 51957cec0b358ef9c5817a30f89624e770c3dcbd SHA-256: 88b9808ebbfd05196fa74e67f8a75487f7f628bda3ddca745b040cb6ef07976b
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to T1059.007, and the overall nature of the PDF as a lure suggests T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://smidgel.ru/uplcv?utm_term=oxidacion+y+reduccion+ejercicios+resueltos+pdf PDF link annotation
    • http://heyumpnd.com/userfiles/file///dumifosojazog.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/84378043293.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/nagemipatunad.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d116e6255---1576846388.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/86120252432.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/76320838679.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/fupazafivenuvovok.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/87937315660.pdfIn PDF document text
    • https://limsurempat.com/contents/files/87024946510.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/42990755818.pdfIn PDF document text
    • http://afslab.asia/upload/files/77246837020.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613002e7d89ff---52833051298.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/58794124842.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/81955489917.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/xilufarev.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/25572401728.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/40328909086.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d295e87f8---6727373673.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161332f16b8e81---rumubaxazowopagumepamefu.pdfIn PDF document text
    • http://kvrhousing.com/uploads/75021911512.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/77882895971.pdfIn PDF document text
    • http://orderkai.com/uploads/files/91495827977.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210908_070010.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_off0000f978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF978 20900 bytes
SHA-256: c1aaf31b244d9ccf02f48607e17ba8ea76a9731fc3ebb9e9aa320af67ee86a39
font_01_sfnt_off00012edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F4 11084 bytes
SHA-256: 9efde55a3b378efc01ee4465ea82139725c3de444e0db0122479f277dedae839

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