Malicious PDF — malware analysis report

Static analysis result for SHA-256 df09334015beaafd…

MALICIOUS

PDF

70.9 KB Created: 2021-09-28 03:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 37eac2e3e6fead9802dbafec19ddfd17 SHA-1: 61181cd6fe980e1d315427da34b20e7e779fb1fd SHA-256: df09334015beaafd2100b4c1665cf0574ea7e7dac7a8877adf608eac59fe662a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions to open a password-protected archive, a common tactic to bypass gateway security. The embedded URLs point to various domains, some of which are associated with compromised CMS uploads, suggesting a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://inwebjor.ru/uplcv?utm_term=earn+robux+by+watching+ads+2020 PDF link annotation
    • https://lederstuhl-shop.de/ckfinder/userfiles/files/zeroruvudujexerarexok.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/ragarewapiliz.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/48913400662.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/zefadibe.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/42087683368.pdfIn PDF document text
    • http://riversedgefm.com/files/file/filetazuv.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/20401317431.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/56743686070.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/21618491033.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/ridezadijizoz.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/donerefegekabowaxudisel.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/bb6e30759ef7e8066d2d1b5b9cc480ef/55297703784.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614be5b9be6e0---1763511083.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/veporamukunuriti.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/wizukukaf.pdfIn PDF document text
    • http://pronobile.com/catalog/file/wilidinipulasivog.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/57410092437.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/gekigo.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/f1bfdddb1ce4db5e8509f9d353b428e4/dagowamumusof.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/92c9e69c5895847d39be745e363192fb/jasotan.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613febfcce8b8---24885138175.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/kasexoxa.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a67c3a46576bbadc082373f6b08e2356/89768460989.pdfIn PDF document text
    • https://tsegypt.com/file/puriwadefeduzinuvegejo.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/97186792343.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/61229803623.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_off0000b5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B2 14784 bytes
SHA-256: 347cd2ee608f09f6557cb6185b9035b05c4bc166adba7e52287ca16cf0ff2e1f
font_01_sfnt_off0000db13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32A 11236 bytes
SHA-256: 81bc89e836ddaccf72903ab6a7693b9170be96222e5b8c512ad96c3609025ca7

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