Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa3ff2a59c2825b…

MALICIOUS

PDF

76.1 KB Created: 2021-09-14 09:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 63fbea55a2efab8980032863fa642375 SHA-1: baea76272634eecf2b4dc6ff2bb81cd381767b62 SHA-256: 4aa3ff2a59c2825b750b4e1466eb20b6dddb3a8e2e7b950e78900a149bfb565e
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate an attempt to lead the user to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://bruceautoservice.com/files/file/22631235996.pdf In PDF document text
    • https://vegan-eshop.cz/data/file/38793693490.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/65769720709.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/50185246447.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/kosol.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/tifigasugepalexijide.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/90631470472.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/7967130b544e4148f4c27976402de7da/57482485649.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/goxifuzafexitolas.pdfIn PDF document text
    • http://agrion.org/upload/fichier/gidefusosovono.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161372a698ea37---29435007266.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/53536857525.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613a12a6bddcf---sidatesezibafarefazazeji.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109111553027324.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gopiwedenazobefes.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/42426220518.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/viwamaxezategefasana.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/kulop.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/26457945520.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/jowuzotigosupolonuwojop.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/kenupili.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16132f76812b06---18567685963.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210910052527.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0cac9bd98---xinijo.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/30530214218.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/kudifeforagugusew.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/ladebusokamodudod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+robot+and+the+bluebird+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_off0000c4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DE 17856 bytes
SHA-256: 523c96becf6b4e71d2114d3bd900e287b6f3ab49460c97ce72304855f6f46562
font_01_sfnt_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B26 10628 bytes
SHA-256: cec7182f3aa52395d96b6ea4c3e72de92ee48f175f0e3d702b608e86c67d217d

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