Malicious PDF — malware analysis report

Static analysis result for SHA-256 c73cf1fd1fa8f5d5…

MALICIOUS

PDF

86.6 KB Created: 2021-09-07 12:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 92ee6e4674620a60a2586888cf3ae8dd SHA-1: c3290fbba570b66482ca1ef9630fe742f10d0f81 SHA-256: c73cf1fd1fa8f5d5fd148cc526058b59c8e2939441686adb9d6eeaf1e0ba2887
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features numerous external links, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://daaeportrett.no/upload/file/rarowusigewewupolunodaki.pdf In PDF document text
    • http://technoauto.jp/js/upload/files/94033553211.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/tufabadexigevusimijudinaw.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/94469650575.pdfIn PDF document text
    • http://m2m2design.com/userfiles/73653053575.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89665000947.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/vazazunenirinin.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/84a02cda917ac9bf2c754bd1536f359b/mowewefiz.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210601_780D5F1FD5EC3586.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f637af82d---dezesezovavotomawazilej.pdfIn PDF document text
    • http://wallsfamily1912.com/clients/876683/File/putikepamikunizofobi.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/lukejuponopugorejuzufo.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/2902822163.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/pukupafedaw.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/tefofil.pdfIn PDF document text
    • http://scsytech.com/upload/files/53231377672.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae98b7c92e---33294493902.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/058775b91f010904b426240f60c659d8/fikikuwemopoxi.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/1d7ce67d3094193f012cb83984702c09/wujerijebevovutifuzat.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/69301183738.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b62b92b3ac---disovixomaditipetuni.pdfIn PDF document text
    • http://crediramasrl.it/public/file/vojibapigusutumazexe.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608007ca7295c---jedanodolivotepad.pdfIn PDF document text
    • https://clickbox.ro/images/file/vepuf.pdfIn PDF document text
    • http://lalinpress.com/ckfinder/userfiles/files/dufozigugigamenelirawono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=cattell+trait+theory+pdfPDF 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_off0000eaf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF2 19424 bytes
SHA-256: ad7baf902d256a9ab07f8d4b579c90b60c10f43f1f91274c3f5231c09daf1782
font_01_sfnt_off00011c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AB 10468 bytes
SHA-256: 2757669fa645d2fd9e3fb01922c9a4f7ff4cbc7fc8ccd7d7d56626355bf3ec49

Open this report in the interactive analyzer, or submit your own file for analysis.