Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b67c481720414e…

MALICIOUS

PDF

85.2 KB Created: 2021-06-26 05:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21427ed33517b69edb98537b9398d450 SHA-1: 52335d78fed56131725b4dcd15e483b0ad7d29f0 SHA-256: 31b67c481720414e572fe204ca712b165d3576768247395520018aaf686c7262
156 Risk Score

Malware Insights

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

The PDF contains a link farm, with multiple URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external links suggests an attempt to redirect the user to a malicious resource, potentially exploiting a client-side vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/pebpm713e1cv5falhnbco8a6e5/milojaziveravafeta.pdf
    • http://ifa-astrologie.de/userfiles/file/72905130054.pdf
    • http://bigxra.com/uploadfile/file/2021052515521473499.pdf
    • https://manuscripthandler.com/userfiles/file/83601893473.pdf
    • https://badrivishal.com/media/14151665255.pdf
    • http://uptownherndon.com/uploads/files/45976460638.pdf
    • http://ttlh.vn/storage/ckfinder/files/jirazakuti.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082fea8bb5c5---36707036566.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/f64bc6eed869aad885671ec3f6dd1fe1/25107536101.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b49692cbea---xokelinogot.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/0bcab7ba656d94bf3b0f9b8d88039592/munevopizake.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb9078a768---berunivuresa.pdf
    • https://clubelsendero.com/img_pag/file/62820739279.pdf
    • http://allnatureint.com/userfiles/file/74443259359.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967abe9cc0a---manojosixemijori.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/189ff2ee9c2236cb8927e63ed1e2c2d9/75446978921.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b29191b605b---3740305109.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea4c3272e2---96079006328.pdf
    • http://abimobiliare.pl/pliki/File/25492191042.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4131b5e3dc2a17c739d00f4caa4a86a7/40612606925.pdf
    • https://bodegoncriollo.com/userfiles/file/budovovod.pdf
    • http://araonline.hu/uploads/file/zezakinaromejapit.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/21c0577dc128cf40d5186c465d21e601/ropijewajejunanimamale.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=sentimental+father+daughter+songs
    • 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_off0000e972.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE972 16792 bytes
font_01_sfnt_off00010184.bin
7a0a331d84444aaf293a4e5a4fc55ee461106ca17ba718baf8a18e534189e882
pdf-font-stream PDF embedded font (sfnt) at offset 0x10184 17184 bytes
font_02_sfnt_off00012e38.bin
91d647c90e2efc7c0b01340c68cc624acb597be9f5dc908e373c51677dd4fc67
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E38 10976 bytes