Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba60eb8d9c411b51…

MALICIOUS

PDF

86.4 KB Created: 2021-09-01 12:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 18f7f012510c8f77f8a9b1600a66add5 SHA-1: afb74de857907be4f879ec801f5f7c3a45ec9c09 SHA-256: ba60eb8d9c411b5143700437ca365ec27b11ddd372c128eb7641bdaeaab030a5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs that lead to external sites, many of which are hosted on compromised WordPress installations. The primary goal appears to be directing users to potentially malicious content through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://equantumconsulting.com/files/files/gelodipuwugigeririkepapiw.pdf In PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dae257a535---sukerafazuvufukede.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/6586434595.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3031234246---xogedabiwejis.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/vunoxawolepuguzevep.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecc632542c---daxazukatojenuma.pdfIn PDF document text
    • https://alutat.com/data/file/derovavaworojizikatudetad.pdfIn PDF document text
    • https://blokhol.com/upload/files/sobukiz.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/i2tomh25h6vgiiqum0bbe0d1cg/7240327891.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/petusovepe.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/bunosewuwaxiwuvekofisapoj.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/78f8606313bf2a3ddc88b35057f3238e/bozosawofola.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/vedore.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/91929124396.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/sikoxakewotutelebujuw.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16105fd32b2f18---10916100038.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/28042018396.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/02plmuoileqp9urpbdlb452ak5/nabisabulifevozorixaropi.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6317714e05---ligenazaremazawovu.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/zuvuzakodezofugidigapi.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109fa19acf17---50543331554.pdfIn PDF document text
    • http://etre-belle.su/images/file/vasumifimutatezadezezusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=multinational+company+isPDF 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_off0000ef96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF96 10508 bytes
SHA-256: 718092a452ad4a1f2fbd4a337060d537b8a7fa649d2b508684324e82453f45aa
font_01_sfnt_off00010786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10786 16760 bytes
SHA-256: 775909a76dc52c4ae144e8fdd7e74c3399a0529171603d9410228def395b3479
font_02_sfnt_off00013307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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