Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1f999a36f59b2e…

MALICIOUS

PDF

79.2 KB Created: 2021-09-08 05:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fe3db07cf0a8c27263b60d24399dd568 SHA-1: 000e91643326e7cac6fc25eeacf5bc45cfa7afd7 SHA-256: 4e1f999a36f59b2e3d4830cabd38139551aa2018fcee49b763b9397b2c143838
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable or compromised CMS upload storage. While no scripts were explicitly extracted, the presence of numerous external links suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160780ccea62d0---tepezusukapopenu.pdf In PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612a0808e4574---bukilexojozusid.pdfIn PDF document text
    • https://drlanda.hu/user/file/nafane.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/dugomikifusitomorup.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a61713aac---rifonume.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/puzutewase.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7cea8f4de---914694551.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/77481297500.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/zeguwagesimefiguxuni.pdfIn PDF document text
    • https://inks.bg/userfiles/file/19534415843.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/ebeaa727e092108525ead5007a58dcd7/12710729789.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c37961254---rudizaforepubawalugu.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/db1b91dea856ef83ab1c5bcbfc37731c/lutaroxezivevenakixegamed.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/4783194026.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021051504243273499.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcc22f11dc---xaxoto.pdfIn PDF document text
    • https://bem-sa.com/img/file/disomakozigisebizowasoje.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/tikigilaxe.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/warokaki.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121a9b594888---80615268841.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094a33196eb4---63876261849.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/pi4hjpimfptc0qtf1jsphsjqu5/bezugitezekif.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/nkgr7d66gtrdk2sen0h5srut77/lowasedugex.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/15299780875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=digital+image+processing+nptel+notes+pdfPDF 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_off0000d200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD200 10964 bytes
SHA-256: d861bf9a9026ac0905255d17e042ea5e7a5d3b51ae89810e6a3bfa8681ebb340
font_01_sfnt_off0000eb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001033f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033F 17060 bytes
SHA-256: 897ffe0d741b54fc2b0873d99891b07fd7995d96850d988b82e908f88e3c7a04

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