Malicious PDF — malware analysis report

Static analysis result for SHA-256 c227e42131c5b15b…

MALICIOUS

PDF

151.2 KB Created: 2021-07-28 11:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 99fd544a908e658ac0135867c64c699c SHA-1: c66808542be551bf07d9d2dc8b52b6be2384c6f3 SHA-256: c227e42131c5b15bf7d2fc8ed7ef8e7eee04e4a91ef19df8efd70536b24397ee
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains a link farm pointing to numerous other PDF files hosted on various websites, some of which appear to be compromised CMS uploads. The primary function seems to be redirecting users to potentially malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pivotal-technologies.com/userfiles/file/wuremaborowekufigawaribe.pdf In PDF document text
    • http://currycornersugarland.com/admin/images/file/27903579999.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/log9v9lbopcbqiuobcgvjvg9q5/50059477062.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-20/20210520235239911485.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/52920683307.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/74336426556.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/wosawu.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/kikugigimagoligijomekoja.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/q6q9nk5j1kup5d5n57hk063hn2/6759024678.pdfIn PDF document text
    • https://arerp.kr/data/file///22245496628.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/029640a10bd98a0dc05bd21149b60b6b/dexuzitepudi.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/eiqsrri8ngr6kitjb79ahshg50/44542238731.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/9727c75b864727afcab4c2726710a6f9/sofulegogozaxagozataper.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5930d13acc---xujivumagabapazu.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d157d99798---2715936082.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/0c88abe6983f7c6655f820a0dfe99d58/faweviloletitexarijige.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/77388289046.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/6ed131136271317c7ecc378115d28acd/37531942198.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/21646046536.pdfIn PDF document text
    • http://hudsonohiohighschoolclassof1980.net/clients/7/7d/7d4b1ad73701457990394555a34ab01f/File/nimijidagumakobiguti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=a%C3%B6f+sosyoloji+sosyal+psikoloji+2+ders+notlar%C4%B1PDF 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_off0001ebe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EBE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000203f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x203F9 11188 bytes
SHA-256: 146bf27d82e25cf8e7e0205c9c6688d8516e8fe2bf223d326672eaf4b3715b3b
font_02_sfnt_off00021deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21DEB 18988 bytes
SHA-256: 8c2e17608aa842ea14db76908f5b36f70cf5077f87bf394d5223ccb7197a89dc

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