Malicious PDF — malware analysis report

Static analysis result for SHA-256 376bc54076b9c0e5…

MALICIOUS

PDF

77.9 KB Created: 2021-09-18 00:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 161b95bcecf3100267a8abc48ca8e92b SHA-1: daca26c0b7485d6d14a8be0ee6886be1182e4866 SHA-256: 376bc54076b9c0e5a47a6fad46bf3de1a37073e959835e120d93ace451138cc4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://futimisdev.com/userfiles/file/liriwesotisasovep.pdf In PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/55f3c564673706a2eaa692a556625477/zoxepepiniko.pdfIn PDF document text
    • http://15881588.com/ckupload/files/93294215644.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/10529332328.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1631441706284433795.pdfIn PDF document text
    • http://wawa757.com/uploads/files/wazawuxepevinowozunifiz.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210903_54A11905B481CC53.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e957a40c3f---43817112095.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/2dc53f3878187f930ef5758377ca73dc/98080654341.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/sorivokosotemepojazol.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/60394142538.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210912_6401C0124148EFC0.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/46328510090.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408ed6a570d---pefumawavor.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/xunawawusopogumoji.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/94993294169.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba08a7dac3---gakexadubikunopako.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/tizadami.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/4869200655.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ed706d45c656b657c65b092c034cfeb0/41989015237.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/58962407633.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132e30684ca5---kinuwiran.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/gasuguwesaxoguxekevewixa.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/dojegitogado.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/zabusoselofejezilevikunap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=among+us+download+for+pc+windows+7PDF 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_off0000ceca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECA 10948 bytes
SHA-256: 0c6401075ed51702367e6ae23e534186605cfdda495315248dca977206d0a324
font_01_sfnt_off0000e812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10024 16080 bytes
SHA-256: 53303b2133135023c59239887f31572a3dc39e01cc7fcf34a67f5333803bb9dd