Malicious PDF — malware analysis report

Static analysis result for SHA-256 071523de5cf50c3a…

MALICIOUS

PDF

85.8 KB Created: 2021-06-26 15:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6b426ef8e359e48498b9d127ab868a45 SHA-1: ead2f903eb5dde13398d0bfcc5da5c52918d587d SHA-256: 071523de5cf50c3a33218043aa8e0f1d063b47775d03c00660cbd6f0ef8c245d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive use of compromised URLs is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://catamma.ru/uplcv?utm_term=how+to+save+emails+as+pdf PDF link annotation
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd1d5ec557---judoputureziritofo.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072f0538ebdb---53844540630.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859e5dd00bb---34554042047.pdfIn PDF document text
    • https://dannysacademy.com/ckfinder/userfiles/files/kaforilesemeseverazofoji.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ace37ff1910---wopazili.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/51611156535.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/jumako.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac128f2ddf0---20823237436.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/rovurutikitegi.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/cc0dicu6q434h1g4ji94sdott1/63554035470.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/nedevukevufotoxexitusina.pdfIn PDF document text
    • https://schmitz.cz/res/file/67031772570.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/gusimatijavinejazokufi.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/tavawobilizanug.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/wawefov.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/9k9u0g1dmaklua9i1ct13626u0/siwejotin.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd68056a8d---79448388735.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/25773199481.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7df8b66a0---5881645419.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/kovorigugawan.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee0634ef3---wafuse.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BC 10600 bytes
SHA-256: 54dcddc82200212ec37ae09013d6ca11afea5d16474c566d1183a8b3372806cd
font_02_sfnt_off00011df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF7 17200 bytes
SHA-256: 4e4f590d67aa22f3097c4dcedc908cc2d6a0e5b5e32ba4c743d0239de64547fc

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