Malicious PDF — malware analysis report

Static analysis result for SHA-256 96a44bf32a58651d…

MALICIOUS

PDF

91.1 KB Created: 2021-07-19 08:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1aa8b53c5927838e2ecebf07d744ae18 SHA-1: a4099719c916084c7ea20227bc4fad46e47a9fec SHA-256: 96a44bf32a58651d1643a85c15a9ba1ddbfd5becae6514eb5dbfee7b083c4834
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malicious content delivery attempt. It functions as a link farm, with numerous URLs pointing to files hosted on compromised WordPress sites, suggesting an effort to distribute malware or redirect users to malicious sites. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a6bc070177b972ba46ac9c9402fef3fd/jipugapavunafinuxili.pdf In PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/62646912940.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160980d4d84c33---lenoti.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a31ea10dbf---zorokis.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/0938e8301f89b3f841189688dc484b79/18291374997.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/77202541763.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/subivav.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd8bd5656e---gokedab.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/49431097895.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16083c5cae1d90---80307794610.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f40e4ee63---79966278128.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/fb1ljnvg3b9fjii3jif2t1dhjc/keporuzonavifojudul.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210716100004_nelucm.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/nenotuvus.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0f8b71dad---pawebojifoguf.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/43888659214.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c1a9be86d---94337871807.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/7828332d9787af91144bd3f82d47cc9e/rupupip.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/20m735epcj25q441tf3e5ekt2t/51891267436.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/38094039808.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e45071f97d---54966540809.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/90156270563.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b1f48a7c4---zogopetufiropaniletu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=human+body+riddles+with+answersPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/88744627c4c1256c6a6c1979cb81b9a5/97023004006.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_off0001004b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004B 10944 bytes
SHA-256: 9b0c322da5af8f236cfb5f03b0d92d10259b04a8b0e36e8f5e83972adc57848d
font_01_sfnt_off00011972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11972 17712 bytes
SHA-256: 0bc90ebf073788f0ecdb04f4a83e98842a50a940b28e014139087b1890054bc9
font_02_sfnt_off00014807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14807 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1