Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c9f26041020433…

MALICIOUS

PDF

90.8 KB Created: 2021-08-11 18:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7a6b0b7d3950020a61a708b237226cc7 SHA-1: c29e7c72f730d462c0b92833b5051f73ce59a59f SHA-256: 78c9f26041020433693915256af61b2839540535b520167a21f804d80a003d20
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or serves as a phishing lure. It contains numerous links pointing to compromised WordPress uploads and disposable domains, suggesting an attempt to redirect users to malicious content. The document's structure as a link farm is a common tactic for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smidgel.ru/uplcv?utm_term=what+is+the+importance+of+personal+development+in+career+planning PDF link annotation
    • http://dsagco.com/Upload/file/rinazitigorogif.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/56403336380.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160982348b00ee---lorivozididozit.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609891166b704---15675493710.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16080f16d1d2ad---19106447257.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/277b3590ae4539212451d26f06f5571b/82609920869.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc5c262d59---fobitorujenovonefijobusud.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/99977175525.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/50327050708.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/jasamemak.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/30602290468.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/97cagpcl8klqqof83e37r6di83/vufumagobenupojolevorutij.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a542d89b23a2664b36ac2d235ed2627b/depupuwiboxov.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/20292028380.pdfIn PDF document text
    • http://fkhd.cz/data/img/99076509625.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/bulimovusitebedodeb.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/0f088305c6fd7fa07c10aa8a8aa5838a/janiwedisavijabipajirub.pdfIn PDF document text
    • http://boldogelet.hu/media/jofokipisawupuzesupekog.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/76388381954.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f7f4ab30488---liniw.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/nj4vppht71u4o2396vthrdq849/45960951387.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/487mm6h96he7ji4pg0lgkf6u66/pamobofipa.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/8257380598.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/kukimazekirudufemojulo.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877d3410eea---33531115606.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_off0000ffd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD3 16576 bytes
SHA-256: 04f4637c9564f74458381308269f37f38b6a92ffe90b530323d98c9fd5fd73b2
font_01_sfnt_off00012a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001428a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428A 11128 bytes
SHA-256: db6220864aca00f81025580e53d7b3c62ae6d82e10d3ed163197d96b4f1aaf76

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