Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f1b2ee0d0ac7a10…

MALICIOUS

PDF

84.0 KB Created: 2021-08-18 22:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0df2c0e79fc0a3dedbf5ca6050a8056e SHA-1: 932d7cec909e45b2f9eea8866364ada8f59707db SHA-256: 2f1b2ee0d0ac7a1071994eaac479f684449454536121ee6355f54dfcba724ca1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://colorfusion.us/admin/images/file/zugilaxavix.pdf In PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/953c4774ec4daaa7e100af4e5aa1fd4d/gesixusinuw.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/96308616126.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160fdd18062334---37959810713.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/47251282692.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbcf406c4b---sufizeliw.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/98862348516.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/74749088318.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/16396780904.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/fa4q26habotr1p2edlas77esia/guwopigedev.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/1a7af141928943006617dce8e49ba43c/sarivi.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/9d6f5d99e37223da4825b10ba7f8967b/2902449438.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/181dc4d69ef3f796ec47f1938f688fec/damajudivozedo.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c4fa1993e---80527487889.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/33846885101.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/45075484870.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/womovabujug.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/15684678707.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/i32m6a6ejc9qeai5560h8upiv2/1848791843.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16074a3d525650---99715114098.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/87240411240.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/9829d590104d4f081ab4d8ec4df8e43c/bibosaridutixoletufalu.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/im2c7dcrs8qiq4tn4qdcotgdsf/jazazenal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=why+do+you+smells+like+maple+syrupPDF 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_off0000e33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33F 10752 bytes
SHA-256: 1326f054aa554b4fdd94ee7c2b12fd8abb095a9fc3b05341c31a4b4dc71f3c6b
font_01_sfnt_off0000fbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11402 17272 bytes
SHA-256: 96f91f53640bb319680e1fa5975556c01d0a6526ad3c6896ba353e14b4b86734