Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa99c15c1ba336cd…

MALICIOUS

PDF

96.8 KB Created: 2021-08-21 14:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7e3e464f1ffaf050ed48b2b4d2c4b4de SHA-1: 35f217c4d3dd6b3340cda4e357d5ac59589ba683 SHA-256: aa99c15c1ba336cd2812acc48951630ee3ecc6d3faeab1e25f636ed4cfe01be4
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of multiple distinct hosts and a high number of PDF links indicates an attempt to direct users to potentially malicious or phishing-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/n79d0r2v5qu0gjp8iq64m1i7mq/wodif.pdf In PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b3aa47520---9526126899.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/t0t72td2aq36ocavbsqrvhco8f/simugu.pdfIn PDF document text
    • https://fallsplat.se/file/lirodobonenukelip.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a93484e1c2---55770768124.pdfIn PDF document text
    • https://inncredel.com/uploads/64942306654.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/6550498f5d14f8867645094d437f8214/2093368095.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607c865d743e6---tafekowizi.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/f29747999f7480a247220fe5f42178f6/sejolivosaxiluse.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088851af2a03---zapafasuwazibuginigowixap.pdfIn PDF document text
    • http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/70588703403.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/54e3fad89009ff4573d3f41bd0d6f9b0/zatezovexesefaku.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/de6ab1d1421bef5901c6825d2673571c/verabum.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/25b6476f0c622466da57f5777f0ac1b0/51372970933.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d44fa0792bd3c1c614a3aee1eff74602/povogesuxepidojugewijenew.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ppmgfc1l2hm65pgjri88ar8uju/pusokokisixubekuzinamukad.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/64917395479.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/galur.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/47071513755.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160819098a0a86---jatavikujogu.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9e4331ab389c1967074ba7f42d53557e/9664935720.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/sowubumixafirisutitep.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/22629191705.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/xezovijixesimeninewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=where+to+get+argon+crystals+warframe+2020PDF 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_off00011304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11304 11128 bytes
SHA-256: b588d493996eaa0e346287b944252cd6784acdd382681454a94d4f962a84f418
font_01_sfnt_off00012d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D04 17792 bytes
SHA-256: 52598958a2dc18bedc32e57216d1f8d99c194791027de09f57acc069d3fbd05d
font_02_sfnt_off00015bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1