Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd276d21b84f2e6a…

MALICIOUS

PDF

87.1 KB Created: 2021-07-05 23:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 789a78068c38bc6d84f43a42a2a61749 SHA-1: 376fc5104001cc2785e9cb4c968d26fb48b2d143 SHA-256: dd276d21b84f2e6a1449a5fcac1fb3e1aaf5d4fedef805adc2c4eb4c4a090699
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm or redirection mechanism. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=david+chalmers+the+conscious+mind+pdf
    • https://brothers-music.com/ckfinder/userfiles/files/wijuwologini.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/efnfilvgg412d8r8c04mu6qdtc/rekumuneji.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7c49020d3---38009482048.pdf
    • https://gegeny.hu/uploads/file/76458627118.pdf
    • https://holocaustresearch.pl/nowy/photo/file/75161621149.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/47dec80a584e34bde5641f0ac7162fa2/77911483079.pdf
    • http://arredamentoambienti.it/img/file/6009835228.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607af56521bcb---wozefojeju.pdf
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/gowitosidibawejojit.pdf
    • http://spearmanhsreunion.org/clients/e/e1/e1754705b4c076d7cd520c5e9e79ed07/File/jarefigesajamamimupojubu.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d617f10047b---kuxelapapurunexesarokox.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160870444030ca---24059755338.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d3638f25e---komasaxorafe.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/sobopaja.pdf
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/lekodikokodezetuviti.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809aaf0ab18---93297505233.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b88a28c9d1e---kuwiboviremazate.pdf
    • https://daquin-ferriere.fr/userfiles/file/68614983995.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/j85i7513un3kd1mauq4afj71aa/bujirub.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c712eadb8---29554221304.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b22b95bd547---63275938330.pdf
    • http://apexnepaltravel.com/userfiles/file/13781825492.pdf
    • http://isvpro.com/custom/files/nanixijufapetez.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/03d05e31ea5d22598a4beecd3d3f44cc/bofewolapenififi.pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/6b2cc744d7290c60b1ad1d2bf3fdeee6/79700539543.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f286.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF286 16792 bytes
font_01_sfnt_off00010a98.bin
0638abd90a698c36c4421cfed39475b39f6e4874b81b5da9b4597800691ab782
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A98 16604 bytes
font_02_sfnt_off00013555.bin
d91a26505c0600f8855a1795964ec134dbcf49935d05789ea92bb5f8f5eef637
pdf-font-stream PDF embedded font (sfnt) at offset 0x13555 11052 bytes