Malicious PDF — malware analysis report

Static analysis result for SHA-256 554627c30c05307b…

MALICIOUS

PDF

83.3 KB Created: 2021-08-03 10:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0ea42fdfdd9de4d055f7e30db81f3444 SHA-1: 6d00585cbb026b628c1e06efb50f4899177ad402 SHA-256: 554627c30c05307b1a78156c6216ed4db204292c8019a08a9dc7d5fbd5c1babe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://ketchas.ru/uplcv?utm_term=how+to+hack+baby%27s+nightmare+circus PDF link annotation
    • http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/67804519159.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/21c3bc79d501ed8321bd87fa2b889ac5/rurabekoxoli.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7f23ae0db---88765269239.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/23075476146.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///pejefulubavugaf.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105132219334294.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/44401543756.pdfIn PDF document text
    • https://olterus.net/contents//files/7542968659.pdfIn PDF document text
    • http://benetalent.com/upload/files/xadogo.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/68bc0643d72fd901a0f264baaef82308/68143310398.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c220d63b449---3991618943.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b523cb9b939154dfd775db371fccbdbb/zutemixofigoxaxapapopale.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03962414e2---54049041191.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/lilikezu.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/49781460988.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/5fb172691a18be569f6a6fca4b70c086/kubovuj.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/fedagaforisosakami.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/67482868953.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/nitabigiporujetake.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16070a0401328f---lozifasilirebisipewov.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/tofowemelozovukugurapix.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2d25c9bf6---21242215162.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/xomuwolegomagewesexet.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc711fe987e---laninatizexilavizulawu.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_off0000e141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE141 11188 bytes
SHA-256: a3a7edd8f5f060e951029b0c316c2ac1807f881dfccc1ee9fb21229775ccf635
font_01_sfnt_off0000fb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001137e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137E 16936 bytes
SHA-256: 70cf6c5eb7d4ef9fe45723c0ad5401558910488516666a8163baa3f8fbd3f409

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