Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb66bb176039af9d…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 09:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 089f9a5b9bf39bf8e40039849b6fb410 SHA-1: 4b3b5f3c244d9b54e4960f6488a7bfb00cf39d1e SHA-256: bb66bb176039af9da0b37eb381913d35714a44e63368671c0a46b520af9cda9b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=android+app+fotos+ansehen PDF link annotation
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16144204ba69d0---28523552615.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/boruzimifonusezav.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/32956e68ba003c74c847745404c7b486/lidupi.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/51865803249.pdfIn PDF document text
    • http://techbis.pl/files/file/xepilezove.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/1623942568.pdfIn PDF document text
    • http://archbot.pl/files/file/86392226218.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7812805614.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/tetewanogalaninaziw.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/feviruluwowabidukeli.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/89020412363.pdfIn PDF document text
    • http://foxadv.net/file/53703587355.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/somelisomaf.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161423da5c0d97---nijumesasuretivovixumidip.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/levifiw.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/45258662968.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/48500665607.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/sitinev.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/14373422882.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/0a55301712cfa8a54896b656d42258a3/reximofezalotusakupop.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/64674787962.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/86344401826.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_off0000d6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EE 10528 bytes
SHA-256: 6b2457896398a865ef1bffef39b5ec94dadac44362cdf1ce6d3c6f12c06de958
font_01_sfnt_off0000eed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED8 17320 bytes
SHA-256: 08538dcf307ecdb0363c3d3cfb3c288d5dd50b0d7f529fc354040e394b4ee74e
font_02_sfnt_off00011b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1