Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e2dd9e1546970a…

MALICIOUS

PDF

87.4 KB Created: 2021-08-25 14:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 41a9347db330fda2c60d792fa003a1ec SHA-1: 111c0fcfd9172e94e899e90ee8667a006f8d6e0a SHA-256: e4e2dd9e1546970a5cabb8c3efe0795732cbd864131e5a28be402cd2e8835de2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many embedded URLs pointing to external sites, some of which are hosted on compromised WordPress upload directories. This suggests the PDF is designed to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://luatsutiengtrung.com/app/webroot/uploads/files/90184146096.pdf In PDF document text
    • https://sofupingame.com/calisma2/files/uploads/jojowosemizup.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/24692560991.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16087050e7ce7a---5504997083.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/63445850675.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/nulr67i4pga39g2sbgadakm1h6/xekadedebesavipez.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/94480237621.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/jululiwukogoziwawozufa.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/kp09om77l2tvdqnk33ftpp6qnl/besuzakukutogezorito.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/makepizunepu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c7467a653---41632160550.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/jorazazelidabekuvugi.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/b67fae1b979be980c9ca38f78bea679a/39469867771.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/lilojanelarul.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/87744998703.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160703c3b1912c---pupifi.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/36439724504.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/6498399016.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/d13bc7ca15375819dde10ea675d2c5d8/99023875517.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/486c3c23882cef46518a746e827cfb35/tuvepanilusetevijov.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/ruwizejininuvatowukik.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/47156199787.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/77568743258.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8367c57b8---39048739055.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/pepolado.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210811011930-42748415597.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/4sl4r240777hlfptd4ipfgmqgp/30048964190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=lovecraft+the+dreams+in+the+witch+housePDF 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_off0000f13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13C 17260 bytes
SHA-256: 8aeca7f885655fbbe6796aee6e48241fbe71af1581ab341065f4203db526fe6e
font_01_sfnt_off00011e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E08 10904 bytes
SHA-256: 5235859b01cfcaaf93962ef7bcd3952e6d980d04cf0d02a0f3b4c2335e3ac650
font_02_sfnt_off0001372f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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