Malicious PDF — malware analysis report

Static analysis result for SHA-256 523eb213b70d3613…

MALICIOUS

PDF

90.8 KB Created: 2021-06-30 19:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8066f95f976b5ad065eda9cd0c6e364d SHA-1: 9b0da532bd128874dd8b0f03e9009e6d56660e8c SHA-256: 523eb213b70d3613d9844fb6b9e89c5f1b01d5abad4b719f7f06d99495d61460
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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=vlookup+in+excel+in+two+sheets
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b97d14687ab---wazefiragesugusu.pdf
    • http://au-coeur-du-temps.com/userfiles/file/64556527572.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094a050a5077---2196694407.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5b2b1e674---vopivijugemefu.pdf
    • http://adance0112.com/upfile/editor/file/66693572181.pdf
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/38506963023.pdf
    • http://0-50.ru/userfiles/file/48959608495.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad40a6d727d---domodudatanuwezafiwuwigub.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/addc413c0b557a1b4f977a71d210f4b6/rutekoxefazawivelinusaxe.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/d6bedb4f3c93e8b39f8457d2c387a229/38153976523.pdf
    • http://www.iece.in/userfiles/file/mobojovoligujuzatuw.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160933cc8120f1---2217605855.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ac63e138d---libikusubuzuriregul.pdf
    • http://asude.istanbul/ck_images/files/59036781748.pdf
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/22756054813.pdf
    • http://aldara-latinoamerica.com/userfiles/file/37064348661.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6210df126---46667751350.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/suzokadusilerubovi.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bac3fa45207---94783238022.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/4232c5653ef122d418c89900aae6d306/lesitedig.pdf
    • https://aradovan.com/userfiles/file/jivofuki.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffdd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDD 16792 bytes
font_01_sfnt_off000117f4.bin
350b63da3c6c57f54228c65ab994f4c85309da9457107f0ca79876a93d405eab
pdf-font-stream PDF embedded font (sfnt) at offset 0x117F4 10556 bytes
font_02_sfnt_off00013014.bin
4df97c76e32bb013cd910ac61eddbc090439c1605433da9afecb997773b603d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x13014 17628 bytes