Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fdf325773242646…

MALICIOUS

PDF

92.0 KB Created: 2021-09-05 10:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4591cc37fbd4bda1549396178b094ba8 SHA-1: b64882a844add2d59c01368a35e33a55473bb958 SHA-256: 0fdf325773242646ec1118dd1075c90e0a039df63c743894da9b9f54cdb7b1df
156 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate an attempt to lead users to malicious sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://diysmart.net/userfiles/file/wurojamagadojuwata.pdf In PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac69410a909---64564463680.pdfIn PDF document text
    • http://imaginove.eu/data/Files/fogasatuvizemakosoxaxetus.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/78961642437.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/61477417128.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/98795433342.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/dimopodizilewobo.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/dinutovuziwewuz.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/20916664427.pdfIn PDF document text
    • http://parentini.it/userfiles/files/46932731615.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/24930996596.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/jonirizeboruforimulavej.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ad3633de5---vafef.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/zidixufolarunenaf.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/cfdqp1df11ckf0mo1nqv3n7sd3/mixepikenisamixigez.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/a35f3570404960e331ede482dd13ff76/nuvugaserevowobapifol.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/97015370985.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/36094262832.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/c3mi7d1t6tvnk6njv5rt4butpq/lajimex.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b396f13d035---sonajadabefex.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e78ae2da63b---xojogotowulabawezusoforuj.pdfIn PDF document text
    • http://th-hl.com///upload/files/40246784826.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/37629710905.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612940a52554a---wokanojupilewove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pengertian+digitalisasi+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_off000101d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D9 10552 bytes
SHA-256: 0919cec8996595d7116c8eb0400340f85aaeb3348424d83d82a334c05aa2fba2
font_01_sfnt_off000119c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C9 18504 bytes
SHA-256: 7758778e44f6c349d13c28c3813d330c678ff3234bcdd18eeae73867b32351e7
font_02_sfnt_off00014a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1