Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd840963e520f5ce…

MALICIOUS

PDF

90.5 KB Created: 2021-09-02 09:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 40419343882850db8f388ebf96eb5bd8 SHA-1: 692725fbdd55e4097c16375058e52f1b35a62013 SHA-256: fd840963e520f5ce4f902f7c5881b1e63bb5ac1148719d61d3c2dfc150d09990
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://goteneplast.se/files/images/file/38945536715.pdf In PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/risabav.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/b25f7e0b5b19fb5de701953f8f0a86fc/takodojebetu.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/fc29606874adb3d30d3a7c0b47ca3dd6/mipupunubowevafefulirav.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/zuwunatudak.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/v1u7d3k7ls37cdm1402be57fp2/59701707050.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/60921042541.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/3560943346.pdfIn PDF document text
    • https://zlataraburmevuckovic.com//files/93982664530.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae23cee058---mopurikelujotedanetix.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/97621406913.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b62cc09c2e3---34086107455.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0623e43b8---kekisazefofo.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16204774334029.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/5104923249.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/28014609994.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/523f80eaed1ceeacff4da43ed47b9921/7358093376.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06317a933e---rabanab.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/govodemora.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/5794972333.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/fhrrmnifoe557mvuo8p4pbuudv/lemafusakazava.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/26b771c478f95cf368b715c2297eec5e/meneleti.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/nojarigipupodexenetavorul.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/3j1617mhesqshua11gd0tmk3qj/75803320950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mitosis+and+meiosis+definitionPDF 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_off0000fafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFB 19152 bytes
SHA-256: 32f2acdc71de326827082fe63f65955bcfca2fbab01886d5aafd588730bf54f6
font_01_sfnt_off00012cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14510 10360 bytes
SHA-256: 379c83a75d2e33592326ad436c1cf2e39c84fd53424c62e4be7414854bbe9ce3