Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4dfeef0c4688b1…

MALICIOUS

PDF

86.7 KB Created: 2021-09-05 08:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d0e1469da3b7cde0223df0e74792c2ae SHA-1: de96d65105c7454e7a6a51392cf2adbe75773979 SHA-256: 2a4dfeef0c4688b172154d51e1fb43c3256c80c4cb02a74fa183427e499daeb3
156 Risk Score

Malware Insights

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

This PDF document contains a link farm pointing to multiple websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external links, some on disposable hosting, suggests an attempt to obscure the ultimate destination or to leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/4f8a0f8002fb54638f2954c66179d531/xemavunuwawida.pdf In PDF document text
    • http://vetportonaccio.it/userfiles/files/74649170565.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/72224730451.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/98065921973.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/jaruvumusanezeje.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/8fef723a5d9e3f9abcbff7738d763853/pomefibenasexenozovogom.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/2928414845.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/51317e1311e66b130f956a02794342fb/lidezelulabupobigep.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a445881e528---manotutumubuwokemoka.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/39873100953.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/63534c237b45c8fa9f17fabf96a395d6/wavureluxepepizigagulud.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084c920aadb2---wujarazepirameno.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/caf0d2019ca3690b45e95a0df0d4cfb0/kanodisefifefutolo.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/wokevenivojex.pdfIn PDF document text
    • https://thepainter.asia/upload/files/3394268693.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/dd09b7f98a1b8e68f7a18c99cd7b6087/jadejozajikite.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/88491746796.pdfIn PDF document text
    • http://prosquash.by/data/33102472065.pdfIn PDF document text
    • http://ilkemymm.com/image/files/69005390293.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b47446ec3dc---82707991162.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/ictjpkiodbbhq3ima9jrsfrvdj/zizagudeke.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/vasabenewobukefovuret.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=promotional+strategy+definition+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_off0000f0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A6 10956 bytes
SHA-256: 18b341de2b45fb2f89a2c207db896ab49e8efe76cf4a12042156573069e60637
font_01_sfnt_off000109d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D8 17056 bytes
SHA-256: de4eb7414a87220201643e1d39f2b508fad86e4ba9b6bddb89c8ee15c8203932
font_02_sfnt_off0001357d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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