Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d46d22c41fc591…

MALICIOUS

PDF

86.0 KB Created: 2021-07-01 18:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 61b6a55da205322d6b6d31a6c939a5c1 SHA-1: 1e5d157d31a9fb9f8232addd3702601112badd94 SHA-256: 88d46d22c41fc591f460eabd7e141ae337b5a84325ce11c10f3f2dbc57a88211
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites utilizing the 'super-forms' plugin for file uploads. These links redirect to other PDF files hosted on similar compromised infrastructure, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://munord.com/wp-content/plugins/super-forms/uploads/php/files/fdb2973fda75aa6ed428653f092af58d/vokaxuribemule.pdf In PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/71271b6f6d6926a8198ffa18415f2c0c/sirirexovikifaketojos.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/fc2e808fa87cfd76481e79bf71e32be4/walokusogepimu.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084066e9a83b---dalatodepozurogidasisam.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b30003b3d532c4b5903a0dcb94d66a91/27194083047.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/032050128519.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/kifegipevanuvixijejuku.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/df7ce1e1a74f426e8bb628cddef12385/53725082042.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d57a9fc9328---41069937792.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/nh5gh2k4jl2bgd1vdd9hh2s8o8/rezavutaxaboziponunidepox.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/j7dbko91iv0a09s9uumuuo6t37/kufowuverepuruzugaxovi.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/tmmmi48csouku1irr1hu48i757/lanigutab.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/cbd9006abc8a32473c93960578dcda1a/63915462297.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c86a2e4017---nibidopazopofosuwibokax.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/37667478018.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/lusetu.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/d43363c7f7cac3c4a309244e44949dcc/99464948896.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/lovapufebemu.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/ruzavomij.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/minugemerixotimusi.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/noxujosupifaza.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/bb3f54e7829c7f761124fe9d0bd346f6/zogevupupametanivon.pdfIn PDF document text
    • http://dgjst.com/upfile/file/46733428430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=academic+and+professional+writing+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_off0000eaa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA5 17708 bytes
SHA-256: 919fc18978bfca61fe63bc0409462ce31b98828501ef5f7ff633ba389f1e2f5c
font_01_sfnt_off00011915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001312c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312C 11028 bytes
SHA-256: 2b7245ff1084ee29b93df11bfa237c296e2b399fbab41a20017ef8c0ce75f464

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