Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b82958c0e7fb306…

MALICIOUS

PDF

70.5 KB Created: 2021-09-28 08:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b1882e4d79489ea60bed42a6056fa501 SHA-1: d62c49c6f49dbd255c497a6651fe77115835ebd2 SHA-256: 8b82958c0e7fb306164ee6fbce7f39f3bbea940fd08a1225874ee62e949fd02f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly suggest this document is intended as a lure, likely for phishing or to serve as a dropper for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=pestana%27s+surgery+notes+pdf PDF link annotation
    • http://smelawservice.com/file_media/file_image/file/82283916706.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/80271008565.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/vibikuta.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/4556076036.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/74166979423.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fe8a2af5c---83796808832.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/23063142599.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8cf6ebe61---13399223519.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/d1691ad86d6de7355768fa0ff76a8e48/37004341870.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/jejelabajibipekifoj.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/64851949158.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/sizogiduvuwuloref.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/7767cf76cfa6148fc3a301550dbf8196/xerazidezo.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613303d3adb23---40849790323.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/jenorefetedefes.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/bikoriwovutiwimukos.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/fa8c62475133e839fc0934ca4509e17f/63954897013.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614139bb30261---16362536628.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/23340548440.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/9fb0aa843c9a532503e969c2c5b09ad0/37527015392.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/wawuj.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/50989867306.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/97637871221.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/18494949089.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_off0000b455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB455 10784 bytes
SHA-256: adcada4313c594e3bf652cb046172e4856955f2943a884c85c134242494f7bd5
font_01_sfnt_off0000cd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD39 15376 bytes
SHA-256: f5616328703064b07968492f5d0da1ed84c7da49db47af1bf26053e822828845
font_02_sfnt_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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