Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d48cb8270b38ca…

MALICIOUS

PDF

87.8 KB Created: 2021-09-07 00:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e7d06564f0d67c8ef8c59ebdccad0833 SHA-1: 84421f8e4c3fee9f806c09dd99151cb68f3de873 SHA-256: c1d48cb8270b38cae011e975452ec58c368d46d2113b0a71f7ec80a72d5ae257
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the presence of many external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2252a8e96582315e52b8b8448d13af0/94540386719.pdf In PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/rair0e33ck9em18iql6vk3m7q2/92625798180.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/jixesek.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/c296915deed12af25ddcac218ac56120/2507437908.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/daronimo.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/worulinitixefewivufijudef.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ae56459ea---duzizi.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/neluzuzaxevezuraf.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/xuzadukinoxezakoxoxizala.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/39549820571.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/33940325064.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/fc11752e600808d2b80a1f292846fb5a/21353767181.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/28094003363.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/suxisu.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/zesajefedafonira.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/4c053bc1c310e2c881c4eaf68a9dd249/67718229586.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/3b7b13a6adee563c8406a2523bc25e6f/12201309197.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/joduwabejox.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/tipojadovefoburijig.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610eadccde572---96969082634.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/hvet064muj0jpq5gbkpj41vg95/85684614320.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/19655727275.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/98435306575.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/5c8c15d6u63c7gsmal253dl0sm/68921686011.pdfIn PDF document text
    • https://dcimx.com/files/35616514452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=passionaries+tonya+hurley+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_off0000f024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10836 18204 bytes
SHA-256: a1372148c917a502e5b8b98546261c8a2a89f93be7111fee79f3ca092b86cf6d
font_02_sfnt_off000136f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F1 10812 bytes
SHA-256: 9d8745692bf4f3bf229c2d1395536faf9312e7aa00d4bc5ef22e7e84a7ae9160