Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7cc9bf5f04f9bcf…

MALICIOUS

PDF

89.9 KB Created: 2021-09-05 16:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc5edea680e7953511cdfd52aca729e0 SHA-1: 6972df2b2f1dc4b0c6fce44fdfd3ec4008487376 SHA-256: a7cc9bf5f04f9bcfd70c0557ee0488609a280edc93d5bf7330cb1b7ef97ccd15
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing analysis of its specific lure, but the overall structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c937ef1cb4c---koxekibexufimaw.pdf In PDF document text
    • https://pharma-tools.eu/galeria/file/xamidimotubolit.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5f5d05d1a---17381980977.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c4529208fc49ee622ba599fd813e3f87/8729805492.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/6270697583.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/81307809068.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bf3fb5738d2b2f504262c9eaae6f9af2/25555591937.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/f992a219aaedf55198efce0be3d19115/7218560723.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/63969067035.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/70348109233.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/9ovb81355le4o0ac10df923s93/repoditisaberekopejepupi.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16127600b712b6---nepidamawobabesejeburejal.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/zepovovekakife.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160be538073a87---3964105280.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608f152e3835e---27899214201.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/9etstiopmhlhrq6is4ibbmqs1s/tirewod.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/vudagenubojitibo.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/jipom.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/5970833430.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/75905027731.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/52347965934e32c9e52bb90f1bd47e52/dedukuxawunukujama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=nicholas+dirks+castes+of+mind+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_off0000f587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF587 19612 bytes
SHA-256: 800f4147ec38edcb09404a834b68c08a13472ae1da2955429e8c22a545933a75
font_01_sfnt_off000128a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A7 10952 bytes
SHA-256: eb338a6c10fded259478d72c8909c913b20d0ae3baebbc94c6b92f9a7be1028d
font_02_sfnt_off000141df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1