Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c3d750f39e6005…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 16:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 26b5f98d2ecdee8937f08926de77aabc SHA-1: 0fb2e1f5ecbea0cf9dbe8ab57006cfa3cc546330 SHA-256: 85c3d750f39e6005b9306febefce988dff7fd35722c28cda65405ab6118e01f2
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ML classifier and ClamAV. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, suggesting it's not intended for direct user interaction but rather as a container for malicious links.

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 https://acconpriti.com/ckfinder/userfiles/files/migegajanekeso.pdf In PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/361638be82d688e48c7efcad6084f12c/xazujisumalaxupetub.pdfIn PDF document text
    • https://cargotavio.ru/files/file/jagozilu.pdfIn PDF document text
    • https://majubesar.info/contents/files/13665487495.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/xozuboxekuxutobap.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/lewesufutesusikub.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/luwoduzizasuxamasawuf.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/jelopedira.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/90459122815.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210914113553.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/kunulolupawudapomib.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/d20b71169c99959621343631a957ce7e/jevedomutadulazi.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/94602724130.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613270af88017---3700409192.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/3819412530.pdfIn PDF document text
    • https://miminku5.com/contents/files/jufinumutefidinazufulopu.pdfIn PDF document text
    • https://j26clean.com/upload/files/turupapokitutaz.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/bofatekajomi.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/pukotowomosuf.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f219347f96---tadepogiz.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/wefixipukatiw.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/toniditudamuwisaw.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16141682eedbe2---sitojefelipefajeno.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/62311131088.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/rerin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=fifa+20+for+androidPDF 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_off0000b5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B2 10124 bytes
SHA-256: e22b44478e5d7889336945d5de2b390511fba96b5ab2a33527a1a87cbfc934a5
font_01_sfnt_off0000cc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC56 16080 bytes
SHA-256: 491f84047e34f62c149217804681e3e18e1dfbcf34a779fbc158a2a842678f7c
font_02_sfnt_off0000f527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF527 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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