Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82174d5bcc13410…

MALICIOUS

PDF

83.4 KB Created: 2021-09-09 17:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f6b560c6cc1855af8daadb2d965303f2 SHA-1: 4dfc19f70d15ca0e30c799d89147caf25620677e SHA-256: c82174d5bcc134106e2bf4485978c29d95dd0838108abfb22e1545b7abe50fba
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://ketchas.ru/uplcv?utm_term=frontlines+fuel+of+war+cheats PDF link annotation
    • http://boldogelet.hu/media/32341396516.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/tijusibapugodog.pdfIn PDF document text
    • https://dalba.net/other_files/File/6361442682.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/13627186286.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/80216599025.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/lagegelivil.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210906145749.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/93443479442.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630518397.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/zolupunodunabuxevogalo.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/bb5f270741b4d8c1e5bcf1414b208819/lorobejud.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/11163169703.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/jetet.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/movabutazenoboteja.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/libomifug.pdfIn PDF document text
    • http://kccmaul.com/files/files/91044654921.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/wumimumepuf.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/17680300745.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/kapabor.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/b8c4966edf0657e7595d9e3d4f3a4e6b/tetisovafujusadufobojaxiv.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/gijomivuzefezomu.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/xijekoguwovipoxipa.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/gibufegaruso.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/22535212147.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/84d71ece1c176e4394bb0278903ff349/rudurizalire.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/baledajezafezaf.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_off0000dfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDE 18252 bytes
SHA-256: 8c5442ec4044fe574177ea199726ca7f8011ac14a154ff050543b9429cfaa169
font_01_sfnt_off00010f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12783 10596 bytes
SHA-256: 819f6c3aa2d349638ceac6e6881e82462348dabe3ebbfe6bf38f187ac2c3dcda

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