Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbfb8380dacc248…

MALICIOUS

PDF

95.5 KB Created: 2021-07-19 15:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3753982f10cca3c3cb213906afd027e2 SHA-1: 03ec93e446e2b3020a66736057713c4e4d6d1fb5 SHA-256: 3fbfb8380dacc248c0980d7b9335da2c00b1ee54024884471c694ff57856deff
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://zabradli-znerezu.cz/userfiles/file/31863197414.pdf In PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f51ed04e461---lasapematuzovir.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d4efedd4210---pevirunugas.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd72e5a4f65---46912556967.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/bewawiwepopipu.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/57886401580.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/22414524709.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/tasixupo.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076322431f57---71808885865.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/mmme197o2ojv2lmgidbt0539ss/78151128164.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/bowikimupaxupesikusi.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/fudozudamekipefune.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/revowerejebirim.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/zutovagi.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/66607693580.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/75135180871.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608db1d3be2a5---nerewonofe.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/26110303628.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210715_1E0E0E310DB5E991.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/fawibo.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/1vuoorli7684a1cfnh0f3bahmi/8884914968.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160982d63ea7bc---vunekunuzupuv.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a5bcdf9f4ee4af2da32ece179f59adb5/13098798646.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/35653062065.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/e45c4b59e32a79419118f5666b49152e/fijazubulijiduside.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=computer+4+beeps+on+startupPDF 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_off000112ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BA 10624 bytes
SHA-256: 86ceffffd71d424cef22b8adafc52faca49aaa5dd457ec1df830489254d10a8f
font_01_sfnt_off00012ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F8 17424 bytes
SHA-256: ec943d9ab52830c003b3749dbaf4235713466f7e700dcfee90b3b31777cb5249

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