Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb102ae326e37350…

MALICIOUS

PDF

80.8 KB Created: 2021-08-31 07:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e932a5d45d0302e382d3df4f95f70221 SHA-1: 080fea65ef8413789b58d1c59e96ea121346b8d1 SHA-256: fb102ae326e3735061b25f47f2debf29a8d535a778a60618be27efdee6d2ca48
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file exhibits characteristics of a phishing lure, employing a link farm strategy to direct users to potentially malicious content hosted on compromised websites. The presence of malformed streams and ML classifier flagging strongly indicates malicious intent. The document's structure suggests it's designed to exploit user trust by leading them to external, compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://abril.pe/wp-content/plugins/super-forms/uploads/php/files/p4taqgrjmo31ken86kgpt329ns/3560022442.pdf In PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dcad26ee75c---zijesokufupidejapet.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124403f60a48---fesanuweratujegesakepaxi.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608def14e4549---kapijuvesirefapodobuwesas.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/26805661793.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161152fd384c75---zamezet.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/63208058476.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/gr61r3vgrijb367b14ffmev423/35106209942.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/tekawutirekafiv.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/linenogawadaxoxarapubozam.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f69b68c60---5469740477.pdfIn PDF document text
    • http://packturf.fr/files/venebugutorelerupe.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210529213755.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/serabuxi.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/papaxudojujevuworekuju.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/daxuku.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27be77e551---48826518128.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/napuvetuxaxupibe.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/68550003974.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/16815671220.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/vuruririturujoviriwuzetu.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/92003062378.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/wedesebi.pdfIn PDF document text
    • http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/86191445449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=supination+pronation+of+footPDF 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_off0000d9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF202 17164 bytes
SHA-256: 5eef344719099ba0a76f4630d5af9570efa8b0882df3e24dd24a49a9fe6a243e
font_02_sfnt_off00011e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7D 10180 bytes
SHA-256: 84036b0dc964de4d45128438d3d31a117eb947640c15855d5ae41ca5c83c4578

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