Malicious PDF — malware analysis report

Static analysis result for SHA-256 530e34c3cfee5591…

MALICIOUS

PDF

77.6 KB Created: 2021-09-01 01:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6320f652fd79a77f38f138f69f1460de SHA-1: 6ce0dfffaf37ea0cc8456623dd17213bde0998f3 SHA-256: 530e34c3cfee559132c0d9bc016227fcf0a4d57cf765260d9cac6bab9f66b2dd
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous links pointing to compromised CMS upload storage and disposable hosting, combined with a "download button" heuristic, suggests a phishing or social engineering lure. The document's structure and embedded URLs are designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a77609bfb5a---38623408870.pdf In PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/miwemobakemox.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/komovutalixuxirikekaf.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/93848543943.pdfIn PDF document text
    • https://x-software.cz/data/file/vadavabuvonil.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/wopalazabadedekuledul.pdfIn PDF document text
    • https://besteva.com/upload/files/20696289099.pdfIn PDF document text
    • http://accessoriesunlimitedinc.net/catalog/file/76189594635.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/60470236502.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/b15a1ae5546aecf2fb70f1226fa5724d/68242848944.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/zoxaganedusa.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/85467009225.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b80e67ba13---26794408848.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/jizatepezunogenazepu.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/3f0abcf09eb202f0646175182bdefc52/70480565404.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/45707658545.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/39911547409.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/nagedewupigurapilaz.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/87805689121.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071da7bd66d6---72653610775.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098295742cfd---zowujojutilexikexep.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/xawadojizerifimola.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/romikuzonuxifazibezatered.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=civil+service+reviewer+philippines+pdfPDF 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_off0000cc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC56 10520 bytes
SHA-256: e3a174fbc7e6a3aa3b7490acd91fb410928fa45d55e24a3ed970eed4375ff32d
font_01_sfnt_off0000e441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE441 16952 bytes
SHA-256: 9e2360bc7e0dda2a272b5dbc665f2113b3db1343b5cc9475780bb531f5849e1f
font_02_sfnt_off00011027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11027 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1