Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c8d45d8651408f…

MALICIOUS

PDF

92.1 KB Created: 2021-06-29 15:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2cc5d6d35991fd03d37468e230741cea SHA-1: d9f21a675c9e5abb3102c155f007c884a102bc9f SHA-256: 09c8d45d8651408fb0c8935ba684daef5e1f0565d69668344d2cf63b009ab028
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL patterns are consistent with a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://inwebjor.ru/uplcv?utm_term=keithley+236+user+manual PDF link annotation
    • https://lensprovn.com/ckfinder/userfiles/files/pujesemura.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c7d82c685---9859501030.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb519de556---jitusimena.pdfIn PDF document text
    • http://humanlitech.com/files/files/vuwatisikazebupopovol.pdfIn PDF document text
    • https://menu2uplus.com/images/file/wabexokiwafojebaba.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771999a8927---pijevalozijerorojuxawori.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/5b2a42cff353a50a37022688d3af6e86/nefopiwibariluwi.pdfIn PDF document text
    • http://www.asslar.de/downloads/78258288388.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c256caeb093---67143047542.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a389d2203a8---wemazefomuvasu.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779ade11061---borubaturolix.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/78694888530.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f53308c75---32352603162.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/8cdqag1n0u61bso9aahchmucig/kusiguzizetaloji.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16086b1245ace4---82983686406.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077c8f91226f---kagal.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/dcf2ac44b664672bba7308a599ad7386/50512062344.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6c21a5cd1---85442614790.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/v3ao6ttqc7a89dkdt40isbr75u/zujufojusifofijefedoxum.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/29224388980.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/becddd5ac03b5e40231f933528ec4b61/vadedukagozafowelot.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160982def40644---wilupariwo.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/53979497195.pdfIn PDF document text
    • https://semut73.com/contents//files/zakadajupijarapadusepujaw.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001035b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035B 17928 bytes
SHA-256: 1f5cb9fa0e1f51d5f9fde998d45d94481b275c5528298841c241d348439bd754
font_01_sfnt_off00013219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13219 10920 bytes
SHA-256: 1e263ce5ff2fa825600a3770c1b96bc77cdf9e03e39d9e078b3d7d6ea1bcbb1c
font_02_sfnt_off00014b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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