Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d7df96640c5875…

MALICIOUS

PDF

88.0 KB Created: 2021-07-13 18:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2fb546bb64fb6442effcabc9ebb23239 SHA-1: 203789f0b29275e1655d82aa9bca2a6dcf56384f SHA-256: b8d7df96640c58759ac198e9ffd8b9a408711f5659e218265efe2ff699f88aa7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://oniceh.ru/uplcv?utm_term=give+not+your+strength+to+a+woman PDF link annotation
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/91b0c46ab0a5394db1251adc280c51be/tomukaleve.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/0c13elahv0ghjkn6edvpuru4i7/nekudidatojuxifiko.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/dagexo.pdfIn PDF document text
    • https://langumeistras.lt/i/File/pexeroxebexekibok.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/9opgglb3sv9mnckjfcba4f6n0q/mojig.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/03f6b52458917346ad4bc907dc9870f9/butagojixamosi.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/kubanunuvowadezatefufarev.pdfIn PDF document text
    • http://htwy.com/upload/file/zopijewibenimapetet.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/16ae03f1d1d82849c737c5a4d6d70bf1/sikoxa.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607133eb59080---36726822465.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/963ab822a275d0a924b4519ab82309f5/daxezamu.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/7hjogun6dst0v6nk1v2bk707l7/22024682940.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/f1c02ef08bd40f64829067ed5b6855f9/99394207754.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/789b8a21749a002a936638a0c013e9e6/botasererisijudaxuvasa.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/fexebedulukofinison.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/duxitidexawekotawex.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8924a3626---widugonofamekivotipodupef.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd193d53b4a---ximukodu.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/gilal.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607196b89c95b---jifofamivopof.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/jezikefoxaxigawugufubu.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_off0000f6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D5 16508 bytes
SHA-256: 94203ace966c11260c0db839e932367381f2f0a3c819a07aab60b568ef03759d
font_01_sfnt_off00012197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12197 10916 bytes
SHA-256: 4ff7aeeb85b03bb4c8d993169e4d50a51497907a8196faa836fd8992bcbe2dda
font_02_sfnt_off00013add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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