Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd054897ba05d262…

MALICIOUS

PDF

87.4 KB Created: 2021-09-06 00:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a7cc5281368d889e04930c5c879cda88 SHA-1: bc9d95617df2627a561edbd6e84880abd42a956e SHA-256: fd054897ba05d2629d803c701565b67c2734dc410c82ab6a65b76d4077af710c
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://psycare-spb.com/userfiles/file/kewajuworir.pdf In PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/gobabumokotukiken.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/92113900802.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/10297184277558e42aaf6e34f0d5ea4f/dolefosixeworexinuzadoxi.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/52149057055.pdfIn PDF document text
    • https://ancoraeducacion.com/images/sujizalodavalik.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/gegavasulut.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/pewumubavona.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/daxununorisoraridupixa.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/7931643912.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/1796688848.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/wuvasekutatij.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/bajafogoniz.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/zoxoduranajof.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/a6c5918e8fa79f1cfafdb550312b28fa/23971679113.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c8875272c7054a751fed16fec4701c90/60388365403.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/jozigaxi.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20218111114265614.pdfIn PDF document text
    • https://kede.org/userfiles/file/78862957714.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/84671082415.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b97505a3231---38248684822.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075c7d1be361---32659797207.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/c7fa70899d72949e79bb1a315987fc6a/fadebumaboxepaj.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/7fcc0e881e19e3c8c141a76aab501b01/29366901438.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/bitufomu.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/tavowivogesamisegamenugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=surgical+anatomy+textbook+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_off0000ed69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED69 17372 bytes
SHA-256: 0eef550a8e06a9ea94f27535eb0e7184a6eec65b4a9a90e6670ac2adf5b6c5df
font_01_sfnt_off00011aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13305 11420 bytes
SHA-256: 0853ca6f0c04e742bbee990c51918a2a877ad0adfdefae58ec0477f822ee01a9

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