Malicious PDF — malware analysis report

Static analysis result for SHA-256 763cd5eb889c4a2d…

MALICIOUS

PDF

82.6 KB Created: 2021-10-12 04:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f9666431031e39673d396b5ebc2dc605 SHA-1: b61720303dc3a18c74369eebec92ad8d9c93dac9 SHA-256: 763cd5eb889c4a2d650b9f58a8055cdfbc8a86e23539a6ceb54cab3da90c41b8
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains external URIs and points to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs are designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=all+of+the+determiners PDF link annotation
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/57717707182.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/32883243976.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/61028669393.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/89958047039.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613308a36910c---vugeka.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/80937017711.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/35695389798.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/weborojodidirexan.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/milidumotivikekeg.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bn7sgu3mlv4gqgrcqel8tto7q6/zuloniv.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/65044406550.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/betasupikasik.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/lowix.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/3021878699.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/kewovivebinojapotafel.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe3db62953---79973365840.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/98fa5ef0e39eb04aee45e8eec88f668c/vusunivovejepeduxazam.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/28289201189.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/77186860600.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/43096577863.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/pujogodatuwirafegixadupaj.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/pulorajezedawoxa.pdfIn PDF document text
    • https://apluskleaning.com/admin/images/file/kidovama.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_off0000de0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61C 18464 bytes
SHA-256: ebaced38ff9bbd5715316935f0f5ea57fe692547afec8056f2456c5bd4c9ee9c
font_02_sfnt_off00012560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12560 10436 bytes
SHA-256: fcfd1ccb8de3b6b145426c12fb02e9798dd8c9b4c4b37c24c76ddc31f92b6d70

Open this report in the interactive analyzer, or submit your own file for analysis.