Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ce91d617b11fad…

MALICIOUS

PDF

72.6 KB Created: 2021-09-19 18:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3127a0616304deaec7d67f53869de711 SHA-1: 7de6460bb8b1daf941931f14d674f7cfd7bf4bd6 SHA-256: d3ce91d617b11fad5f4a4415c4b6dea59abedd4dacefbeafb1569aad0f66771a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm pointing to potentially malicious content, with a high ML score and ClamAV detection confirming its malicious nature. The presence of numerous URLs, some hosted on compromised CMS sites, suggests an attempt to distribute malware or phishing content. Although no scripts were explicitly extracted, the nature of the link farm and the ML detection indicate a malicious intent to redirect users to harmful sites.

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://rainhouse.kr/data/editor/file/10376188126143d0afb4b6f.pdf In PDF document text
    • http://mrybalko.ru/files/66219749242.pdfIn PDF document text
    • https://rinducm1.com/contents/files/68910934907.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16138ec56afb25---77141687923.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109141614312365.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/85287731276.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/milunuzeturozixigubaf.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/kalisitigunimufujo.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/jogevufevasupopejo.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/nusopiwusazerukaxujisuw.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/38320222830.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/saloruramuwap.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/timivono.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/pukaragixuwopetiwisosijo.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/2eb6f9033ba1ef2592a711fc5558bd5e/3801981985.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/zawelikoz.pdfIn PDF document text
    • http://3sdent.com/upload/files/judasotazabaxadefu.pdfIn PDF document text
    • http://cke.hk/userfiles/remoziremedikonamonasax.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/74776690341.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/84992229348.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/xoweriperosuvas.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/26462217062.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/12366761720.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a140c0539fe4eff02ac9d2d91c3a1f89/46137826205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=gta+5+mobile+mod+apk+android+1PDF 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_off0000ba45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA45 10844 bytes
SHA-256: 56517e053c0a9622a746c369ceae7b749a5ea2134c1dc27de708642faea91351
font_01_sfnt_off0000d31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 16212 bytes
SHA-256: 6ca3cd00da31a9eb3d37f7603784758a045271917d82e4ccfd2a722b5dee33df