Malicious PDF — malware analysis report

Static analysis result for SHA-256 600a5234f0b85a54…

MALICIOUS

PDF

81.1 KB Created: 2021-08-13 10:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7719e12ea924d7da7b481382c3a18b07 SHA-1: 383e071dcec10a29ee04488a2402ec9af96ebbe5 SHA-256: 600a5234f0b85a541aba6e3d1020bf7c75db2dfb084a625c946ca94d05843cde
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, pointing to compromised WordPress sites and disposable hosting. These links are likely designed to redirect users to malicious sites or download further malware, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crewmak.ru/uplcv?utm_term=semiologia+porto+pdf+8+edi%C3%A7%C3%A3o PDF link annotation
    • http://peusch.lu/userfiles/files/rufumuw.pdfIn PDF document text
    • https://rinducm1.com/contents//files/55595280918.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/13995133866.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/43976920765.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161147dcd2ba3b---zusevugagikelunasukef.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/7092e297b23067b69b58af61abd8422e/sesinuzojoperexizovem.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/3ugamnr7vk6a2jsel54au17786/22367822536.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160780133f35ad---bagagadidiba.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/sifolozuposogufujaluleti.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/9684890c16580238084921d09715e9a4/78922884050.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607914b37324d---gakikonijiwejif.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/kupuzasanosixubexukemip.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/firamiru.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf88b8da92---58525057042.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/32312427390.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/tesamugul.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/3o452cud61qchn72jsntn8akri/zasut.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/tajorobusu.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88304d006---sodezovutefitopom.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/7500cabbeae108009e4c59a2852c9391/84063087056.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/vosis.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/29611918708.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_off0000db14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB14 15636 bytes
SHA-256: 78a554e7d9d47658bd8c5a2e04f9b1230d198d57ed3faea3b6ab5e8a9b20f4d1
font_01_sfnt_off000101c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C2 11316 bytes
SHA-256: 8269a90ff3c2db934191a56787caa1a51855faee70b99423fcaa14464a7e25b8
font_02_sfnt_off00011bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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