Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d5c38570379dbf…

MALICIOUS

PDF

92.9 KB Created: 2021-08-12 07:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c69b6ef5d42fa7edcb4c9ccacca2ba8 SHA-1: 0620df4a51c5bf21bdba6869ff4c37dd746e33f1 SHA-256: 53d5c38570379dbfefb7c4b8c268bb0471f2f15069307e97358632900bb756f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is described as a link farm hosted on disposable domains, indicating an attempt to direct users to malicious websites. The presence of embedded URLs and the nature of the heuristics suggest this document is designed to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://allytemp.ru/uplcv?utm_term=how+to+take+scrum+master+certification PDF link annotation
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/mobaj.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/25089231648.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c37d3b25cf---xebubizufovawov.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/88823867136.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160809f449d0fa---14428263172.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/jifime.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/136499930960e2fed738203.pdfIn PDF document text
    • http://bamor.org/userfiles/file/34024100856.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210723_081917.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/51741983222.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6b77270f5---65794962962.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/2693896139.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee17d2b028---jakagilopupugo.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/bateg.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b082ffbaad0---15117459747.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/2b7d4ac60dade008945db8605d20d542/vowilizegefumoku.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1414fccf59---36419639557.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/sowoxudadajadafivame.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ba0bs7omvmlb97levpraa3dt14/taruwibakuvemowimuxonuxe.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/e7fd02e5f53f532da8fcb64adc7cdc25/58125965947.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/686b68895cd2e0c6f44b8fe87a76674e/setaniwazejajivu.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-12/20210512115145117797.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dac5a061e---67839750530.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/pobuvu.pdfIn PDF document text
    • 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_off000106a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB6 17652 bytes
SHA-256: d581c2c5ca269cb76766703322584855ae5c2e45b7afcdf2f85ccbca32aaac79
font_02_sfnt_off00014d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D24 10720 bytes
SHA-256: 37ebf2af6be701e48f0e9d22b82ac991baf59e81e9400dcabe29787063815e07

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