Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca19f922b0e6b80…

MALICIOUS

PDF

71.0 KB Created: 2021-09-02 15:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 33e7723520aacef0526a5455e37e8103 SHA-1: a8dc948abd7e02218596304c3dc73c3d43e37115 SHA-256: dca19f922b0e6b8052ce1a6fe5683a211579f410189be94a1e61708fb4c13fa3
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The numerous external URIs, many hosted on compromised CMS uploads or disposable hosting, suggest a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrive.ru/uplcv?utm_term=columbine+dave+cullen+pdf PDF link annotation
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/og2os4ruh4gk4t2f6nun6b73il/buvufilikuvomudupafonor.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/lorefabuwanokujudobakili.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/tinelenob.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/mawabamurutejidiresewodix.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1413913f6---vifat.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/foxalibasirusosopugojenu.pdfIn PDF document text
    • https://olterus.org/contents/files/98642331395.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/beveriw.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/49098613362.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3a55744d1---zowutogegom.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/kmf4onfarr1jr6a8bvabis74dn/28258816614.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/xatemupanofakamirewewaza.pdfIn PDF document text
    • https://orrizon.ru/images/file/94684938300.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/26004900889.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/murozuwobobasapawar.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/58952716817.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed17f5a00ba---xefawofivevosafidudedije.pdfIn PDF document text
    • http://myslizdrave.com/soubory/51686037198.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b9e507f3a74---voraluxamabisa.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/40057883286.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/gavutivinazorugigatatu.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a77c1ce0aca---bisexeri.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/14730669842.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_off0000b6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF7 10752 bytes
SHA-256: 5994494bb353c0155714da2179b128abdfb84cde4eee1b5cae084cd760d50002
font_02_sfnt_off0000e76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76D 15664 bytes
SHA-256: aa94d26ab41a13afbe27afb60edfebdef642da6dcb25e842f6805319220641ea

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