Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c70cca5ee3f9aa…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 15:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b23ed903df995f9a1b28890bdc94bffa SHA-1: ad9a53b5787e4f6d9a127a25bfffe63cd1e8afa4 SHA-256: 04c70cca5ee3f9aac93f8c830e0cc8b3242c921318e45e6515cdf85395b28181
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and numerous links pointing to PDF files hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely serves to exploit vulnerabilities or redirect the user to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/dfb276c7a9be5b444c916faa49ea90ce/10517157617.pdf In PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140a1d7cca46---61724873001.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa81aeb1a7---85605433677.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132c73a6ef1c---450168156.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://shopabrang.com/images/files/figoxosimitebajokuro.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/suvulanowuguwisebowa.pdfIn PDF document text
    • http://shamayachts.com/upload/file/92972101132.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/12977729184.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/govogafobemafulapuveguxe.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16141764f047db---duvotuzataromowes.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/wobokuwemevevimozu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/d7719256b94d609c9795035c5ee59261/5124786494.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613569ff7743d---xaleworozaruzajije.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/bolomolasiwuratewobu.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/kubuleloboko.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/49425407592.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/n42nbq70ueaupvte767n1n2fu8/munigowuvisu.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/menoze.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/10261961868.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/zazoselila.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/88550010006.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/lumugepifoxokutijivu.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/3075981858.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/wudolew.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/kerupajameriwirefifenibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=hola+free+vpn+android+apkPDF 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_off0000cb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE346 10372 bytes
SHA-256: 9ab2d16e2b172ae9b79f8303abb092ed7e60ec84ffd275b8077a6a5ca5a657e6
font_02_sfnt_off0000fabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABB 21612 bytes
SHA-256: 2adeb27ca8ae05fd84ef18a4725c83ef26f729a2aaf434215b5663ee137e77cd