Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b142463fd83ac7…

MALICIOUS

PDF

86.6 KB Created: 2021-07-08 10:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 06da2869afa51bda35e627bd38219bae SHA-1: 5fc91a9132a2cc4ee4d1139cce2cfe6cf5dbfc6e SHA-256: f5b142463fd83ac7254b9fb0529c5408b0121c9828dd0eea6ac4494fa70fa21c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious or SEO-manipulated content. The presence of numerous unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a likely phishing or content-luring campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/626236cc64b139c284573e2ffc334677/mudusepadoji.pdf In PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/6a2d867244677924228c2745ffce35c5/40953031685.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/46950799601.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c983b3adf6---zuxivukuwobu.pdfIn PDF document text
    • http://www.heksan.com.pl/file/92747160630.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607779b6e2ea4---3508247227.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/guxuf.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/ada7e7613f94469b7e25e240cc8216ec/sofil.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/b6f4023dec8c5a8b392210dac1f2b05f/ralokopazemojadodigurag.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c9595c68a2520aa1416848e176761dea/9040326650.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cd426aac430---32995776615.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/rujizibifukepaxixivu.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/16834f7f84acef02ef3a2d488d89199a/497351827.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/lebezojoratezexarulamir.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ei3qg6f69ge0cuqdu5irg81dq1/bigam.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/a9b8bfbfe2d75934dc316bd884a073e9/vipotiwibuve.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/xuvubenowibevunatumilowaz.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b826a938d---73676126777.pdfIn PDF document text
    • http://haverfordhigh77.com/clients/e/e7/e7c5a96ea35a64a1345a575153f12e7e/File/93755658905.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/8905119199.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/29559044729.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/50245336420.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f245798d5e---28578726492.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/seputo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=mila+jo+tu+mp3+song+downloadPDF 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_off0000eef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 17492 bytes
SHA-256: 2ea6dec3c650176a895982c782ddbaeb94d0e6322bd12a290cc19c57f38ddcd9
font_01_sfnt_off00011d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13536 10984 bytes
SHA-256: 9dfbbaa3f925af16d3e7b281182b545ec9b60cd9eec4878921a5dcfc233bb1e3