Malicious PDF — malware analysis report

Static analysis result for SHA-256 82635fc320aeaace…

MALICIOUS

PDF

89.1 KB Created: 2021-06-27 05:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c3b24171212fca99fc6645941bc136f SHA-1: af3e288d2f548564d5d92fdde81e4c9aa5c79e7f SHA-256: 82635fc320aeaace59aaa3b677be44c9ee457b5aff34b7edab4a4be2e44a6464
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute traffic to potentially malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://advik.net/userfiles/file/rifoj.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a54f73b77ba---96411830921.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16084866b28df6---50867063330.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72c1d5aead---fevubufilaliramomesapud.pdf
    • https://vieclamkinhdoanh247.com/upload/files/meluzuzuxupafokexivik.pdf
    • http://j1medical.com/uploaded/file/68793368388.pdf
    • https://porterbrothersltd.com/app/webroot/uploads/devaga.pdf
    • http://absolutelyneon.com/userfiles/file/22798334354.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/105a4f55e761dd5e76b227b66569485b/bimisiranapufaterosamupa.pdf
    • https://actorconseil.com/files/file/femebukat.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/pmp5g31t186kun8i69tifa3s36/3323269903.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c72cf4b3597---fibizoram.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/s8s9attf45opnnhlbs67a3qqv3/bogokevuwivonivewejexam.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609db88e7ea8c---8114738635.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8ff95a671---41934096715.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac09fe59e3b---74824022064.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46cfcdff29---zapegepa.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/e25e1f2c5f12d59727c146a5c0e2fa08/94401881545.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/a857ffbc5962fa32a138a49f55d71adf/xifebak.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d059409dac---100668406.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d3237e191---96346446455.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1e6560766---19790218629.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=famous+taglines+of+products
    • 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_off0000f8cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CF 16792 bytes
font_01_sfnt_off000110e6.bin
ab980fe8ce12eb0a1de1bc15406562e3e91ea46e45470faff910f5ad22ea3322
pdf-font-stream PDF embedded font (sfnt) at offset 0x110E6 11040 bytes
font_02_sfnt_off00012a5b.bin
0ccbfc794fd4765db2bcbf2a4c7264b19a5a81bf2327c08124ee78bc42812290
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5B 17276 bytes