Malicious PDF — malware analysis report

Static analysis result for SHA-256 026a732aa7e96f44…

MALICIOUS

PDF

85.3 KB Created: 2021-09-06 20:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 22bd8885ed994e7b028c93f21cd66bca SHA-1: b153d086f2e02f21b4cbd03301b2021b59d59fc0 SHA-256: 026a732aa7e96f44d261256c18f93b5fd4d767e7d476b45952ace1a6603f4d14
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to lure users to malicious content or downloads. The presence of many distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 http://vtaky.sk/media/file/88443297138.pdf In PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dc0327a12---lirazafukoruwoliluko.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/lomesufaj.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/eooha07vcqmkiekmqupomgt630/sekubizefazezakakusedul.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/35679450633.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/83028649534.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/m3ff43qgfcsdf1jcm3058svk7h/fufonavolunekeratixog.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/vozidazuzorusiw.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/4665dc60c284d0d2b4b9f9beb0addfc3/mumixunu.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/75293978883.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccc0a25768---63957612505.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/55e3c15477ca2ac35af462f74eccdcc0/80162252951.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/29076815453.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/3119c0dee272e159780d62c92be5903b/82111723423.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/25306193731.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/1021789347.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/muripa.pdfIn PDF document text
    • http://slsnn.ru/content/file/61914438761.pdfIn PDF document text
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/4158369575.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912bca9e344---75255333835.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/18a0f5f90196efda656bbfacbdc499de/29400975745.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/i947e70397had6i3sm1b8gi7pc/dezowunumimeleram.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/27313252417.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/66983079812.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210827_7A8718440CE20EDA.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=plastic+surgery+history+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_off0000e3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D7 19196 bytes
SHA-256: 77662aa4ae4290dc467483b2e0f0ba16b391609558fa27ca4c33c6e3d5e5f26a
font_01_sfnt_off000115de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF5 11008 bytes
SHA-256: 88f0687832d0b7968c207b27deb97eb1de6b3abdd2b865165a5755240bb380d5

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