Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe4ff0a620fc704…

MALICIOUS

PDF

82.0 KB Created: 2021-09-21 01:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1f096ee2043b13d5b737a7fd0a3f7280 SHA-1: 4ac9882c918c48bef2b17765ebe534fda9bb1743 SHA-256: afe4ff0a620fc704baa29a2ffe440f4aceb8682e1d7861dabbc6e9dd2b90dc61
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Installation

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to compromised websites and instructs the user to disable security software, indicating a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL targets suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://nomylo.ru/uplcv?utm_term=how+to+lock+a+single+app+on+android PDF link annotation
    • https://semangkabiji.com/contents/files/tegosezofubinaruzudax.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/89744689218.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/67917742715.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/98132511dc25b69c78bcb3c7ddce2b11/jowiwaw.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/0a5d8db3271249e8e57a67d75076b4f8/40024597772.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/21387739955.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/52176453450.pdfIn PDF document text
    • http://tabletopad.com/images/file/femanupepov.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/zilasoboxisuw.pdfIn PDF document text
    • http://erpos.sk/data/files/bikodepilizuxavepuxena.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/4947746203.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/xiwonanakalewolole.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/zofewexadeja.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/xiduf.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/25365635118.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/soforepuzatijuda.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/52456328156.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/76553012562.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/rifinatawo.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3a6837de6---89448755966.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/31975440960.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210918120939.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/navetoko.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/risatobujiropifijugopima.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/vaxolodavizof.pdfIn PDF document text
    • 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_off0000dc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC39 17388 bytes
SHA-256: fa3a7b623bc7de1466946a1b0d5899f4239f4c28238269413789b586cbbcb877
font_01_sfnt_off00010913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10913 10860 bytes
SHA-256: 4e81204d6741427dd7e9e73867af458c4bc0680cd70603c30bc33df8728d9319
font_02_sfnt_off00012219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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