Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c3b52c2717db22…

MALICIOUS

PDF

81.8 KB Created: 2021-08-20 18:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5a56e0a5530934643bd2171c8e44a069 SHA-1: 35bb9b48c731e4c9a0d046cd02f720d703c53f48 SHA-256: 56c3b52c2717db225725d666dcbd07d1d7c896990251affad25c46b2c30cb893
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://pixomot.ru/uplcv?utm_term=unir+numeros+del+1+al+10+para+formar+dibujos PDF link annotation
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/3d83ee6070530a23ed970cb87395b687/wunopenawix.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/91001061182.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b86bcd8b167---4489361581.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104653a439dc---31789950165.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210516232539.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/m28k1i9fouo0n52cd9i6dbucke/diwusekilekaser.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708bf440229---fasukofasupinemi.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/tapuliguke.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/52729571598.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097361ce19df---tipixexozuzufusoxup.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/23989258400.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/38078927839.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/wigusawadatox.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/6386805f24d7a9c807ac0ad006f96121/marozogezosobila.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611c046a0f77b---87307467345.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/83844940998.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/xodeluganubetolirofezusi.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/iah7baqs9er7reo6gf368953c3/zikofaginupe.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/febubimu.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/kuluwepa.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/vixugalepelo.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/b16f2b7085c004806f880f6348f36d52/69000016391.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/64732967607.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/jubojedizetibaxub.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/uqsmgg9n8o1ne3qhrbgk1ci2ul/jedoworidexibapufefimupu.pdfIn PDF document text
    • https://melz-feu.ru/upload/nitedemirirenevur.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/tidatetolojusipuwefebib.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_off0000db23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB23 17148 bytes
SHA-256: 4e2ed3598a2f242c30f4ad2794e8a595a075e9c809506e9b2236153631480954
font_01_sfnt_off000106d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D7 11112 bytes
SHA-256: 5c776ac25a271824b0f9edf4cda89e01d2a1cda330715f8e809ec1207cfa1623
font_02_sfnt_off00012080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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