Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ed16c6623e97d9…

MALICIOUS

PDF

73.3 KB Created: 2021-09-01 08:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a24cc34a01edeef6cddaaf711ae0bff SHA-1: a7b3a119b4f32c0d4412e283dcb75e645155c512 SHA-256: e3ed16c6623e97d97a9ddc8bbe28836fae57518375c182d4a7ac32cd9bc3fb19
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://bebelino.ru/userfiles/file/36887718972.pdf In PDF document text
    • http://1parareunion-club.com/clients/4/48/482fc251494624b09083a87f212a12d7/File/bitoverisabekibaguniton.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/cd43ae82fcbebda11543cb2179ced0bf/38241952759.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/0569fdb2ff9e767b08c0da4acf86d5fb/6041228078.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e2211a5c9172f87ab294e08fafa55da0/71248426532.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160871b5005163---86625749853.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/25864850107.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b86e5847213---repaninomidebamozebix.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/e12a748e7e22035158e8c6025d9484b9/notunijefopupapebejagi.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/b936c265f046e2bda3218d4a26aca663/wovimemupifeselebadu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc955bafd---4049377526.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/retatojife.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/07cebc6ed03050dd81e756bb9ddd23d0/88848041070.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/ziwemeludakekukusuk.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/59697982258.pdfIn PDF document text
    • https://qnzar.com/files/mamuvijadutiwebudejuvagu.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c97970d62b---56676674275.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/zuvokimijufekudubukudup.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021081719445883.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/8371539289.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/43437637826.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/21194285413.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/39836060485.pdfIn PDF document text
    • http://schturman.ru/files/files/72651753456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=yellow+green+background+plainPDF link annotation
    • 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_off0000bad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EB 17016 bytes
SHA-256: 39a57d06d08596606b760bcbb6692ae194ae60235bf5e9c7ac42f6db6e20d3a1
font_02_sfnt_off0000fe75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE75 10824 bytes
SHA-256: e22e104d5fac62ad768101620b7b0c03415bec67f1725c5f8d382206f5ce3496