Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef11c97326d8a28b…

MALICIOUS

PDF

83.2 KB Created: 2021-09-22 17:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: beadc6f9c34d3bf8d74b7a1d8d5f39a8 SHA-1: 716d5e24c1c41629e961cead6f0f578af503750a SHA-256: ef11c97326d8a28b1d41faac5e7b51107e170ac9688135772547ae432cb59fd2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised or disposable hosting. Heuristics indicate this is a link farm, likely intended to lure users to external sites for phishing or malware. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://trustycctv.com/ckfinder/userfiles/files/zejaviriremu.pdf In PDF document text
    • http://citadelcaralarms.com/userfiles/file/48370242010.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613057c030653---17203324158.pdfIn PDF document text
    • http://land89.com/ckupload/files/31933958430.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/votekeder.pdfIn PDF document text
    • https://porfic.com/fotos/file/xedafukuromimabod.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff45065cd2---gepitimuse.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/94487685826.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/wuromujovilinalisiroseba.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/liliwevajusuwamili.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148dd7a25a6a---21957252422.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021913023591661.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/1604206097.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/jimika.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/43718856557.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210922041201.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/53713464448.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/kelavemupejatezupegug.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/gutatu.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/3351062758.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210914043736251.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/33222247712.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/pivamidofemalaxiv.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/xerekupebizadonala.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/fupifitasudogusidawulut.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/desidulevuribefugisewap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=xvideos+app+downloaderPDF 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_off0000dd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5D 10444 bytes
SHA-256: 9df2ba5e7dc1acbb8eb07ef2e955590daa7a6bc0b09458b41cd07a9afa50cdf9
font_01_sfnt_off0000f52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3D 19040 bytes
SHA-256: 839e80b90d8be55e44baef890cc5f0ee98789ead45548464ca8324d03ed30d9a