Malicious PDF — malware analysis report

Static analysis result for SHA-256 533af5a620176f95…

MALICIOUS

PDF

78.1 KB Created: 2021-08-17 11:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b17d7298f0122e41d43433fab974911 SHA-1: 014b85026d8e86bb2e5c2c1f1c3efb95e70d225d SHA-256: 533af5a620176f95446e4a0433dddef1445408d82c0bbd19ddae8e95f0f6dcd9
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous embedded URLs, including those hosted on compromised WordPress sites, suggest a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the presence of link farms and compromised hosting strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crysiq.ru/uplcv?utm_term=navile+navile+giri+navile+song+download
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e77fdd142---kajuxew.pdf
    • http://fine-cottage.ru/userfiles/files/60969312641.pdf
    • http://elateridae.com/images/FCKeditor/file/91425280779.pdf
    • http://girisimcilikproje.com/resimler/files/54929837274.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b16a04522c---nijovalu.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/2cff04be2880e1568fd7abb344d4a921/jajemibem.pdf
    • https://circolodelpistone.ch/userfiles/file/jedudovofozawemopop.pdf
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/75786247389.pdf
    • http://gramercygrand.ru/files/file/lokeregugosuvi.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087bb5e36e01---54411014937.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f2fdf2774acf0b6e554ee1b0da794124/52958392136.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7db547bd2---vurazinedavifezupaporag.pdf
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/70010565001.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/um9m89ad6rtq5pv1n3113mft8n/92589018618.pdf
    • http://iuf.kr/pds_down/files/zemesutopisixox.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/6df838029318b930e94f6ae3c21bf2d9/78720484480.pdf
    • http://bagiez.com/userfiles/file/sugak.pdf
    • https://trotusgrup.ro/ckfinder/userfiles/files/rejinoje.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608673b01aa0e---bufila.pdf
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/menotowe.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/5kn2d3ponr7jombgtrd0e1fi64/zafofodefuxibomozopinonif.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/b75cdf9f73e89b8fb6042d0bcf6877a9/sosiragod.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/up7g7gitdcq9khheqca5tc4343/8930532947.pdf
    • https://al-farh-iq.com/upload/userfiles/file/69560630713.pdf
    • https://vntdc.com/upload/fck/file/mulixavaropeba.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/gobasowibugezev.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfa0.bin
1e41a1b2ab149cd30534c38dce333bac5f1c2969ba32643f5ff00b4f3e5e128c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA0 16872 bytes
font_01_sfnt_off0000fb66.bin
6874b1efaab55883a520fda4d93807f015f127f24d7268fa4151f54c9fb8abf2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB66 10452 bytes
font_02_sfnt_off0001130c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1130C 16792 bytes