Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c0d08476f24ad6…

MALICIOUS

PDF

83.5 KB Created: 2021-09-14 14:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 318d1b9beacd29ee5ca18d2fb1e0d131 SHA-1: 42b8a21b395c49498a9b57d5fae88e83662b87b1 SHA-256: 80c0d08476f24ad6f83e2ac24919de8b49029db90c7cfaba371e5acf25e92d1a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and ML classifiers. It contains embedded JavaScript and a large number of external links, many of which point to disposable hosting or compromised sites, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=millionaire+fastlane+pdf PDF link annotation
    • https://fiberglasssupplydepot.com/userfiles/files/loteboje.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/zuxamux.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/fidixirewogegarimine.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/padonijegomovexusipurovin.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/ruwuxukozowo.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/63721619926.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/tigem.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/59171721599.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/rovizug.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/bigezitotubuje.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/kaneposewi.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138a6e57ca43---venuxapugi.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/55852859722.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/pajubujepeluwegug.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/xuvopasumexibiladix.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/86758127304.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/nekaporimikikanedogibuxam.pdfIn PDF document text
    • http://toonesk.com/upload/jetawumanozugutetature.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/61215920604.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/96256934574.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f81b518367---26867289146.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613313377413e---61059136268.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_off0000e039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE039 18608 bytes
SHA-256: 69d9e3deca5bdea0d60da67f4d7c8b26a8b756161868c7fff11ec9c9e237ceef
font_01_sfnt_off000110a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BD 10484 bytes
SHA-256: 9bd62ef22f70092be62ecab7898afc516b3898d708bfa9272f7b773989357d7f