Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3faecbac74f031…

MALICIOUS

PDF

80.8 KB Created: 2021-06-25 13:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 40ae84ef2e2d2cf135d2c7e7bd6e4a62 SHA-1: bb2742fa9e4ffd1f0d0d187f7120373cb4c6ff5f SHA-256: 8a3faecbac74f03178d7d1a3cbe765e7ed2ca8af148ca9b7d6a5bc87d0eb909c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pistant.ru/uplcv?utm_term=immobility+of+resources PDF link annotation
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/o7ojb1n1ganlftbeileebq9ul6/jamumenotefevetagam.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/adc78b6544893f7a2a31d3c5e1e503d8/sowobe.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/1a981073002a11a1ba521f9563e1e0b3/gawomimu.pdfIn PDF document text
    • https://laps.pl/userfiles/file/ginuxetikafisew.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/12336834215.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/730c0748e710fb32c43a2fcd2462e601/61933467589.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b05d3a6a749---vuperabomozafu.pdfIn PDF document text
    • http://jcpingie.be/public/files/tojakunama.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/65552989907.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/rofuvoperifodu.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/fuleba.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/nm5c1ml5m5aodq31bipdc2ugv3/laxopupixepivizakojux.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/0fe3b98008200420c0409f562ea8ee5e/7883612415.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eac214886b---45986577121.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/ug9j67lf46md5hi3vkm71uvrng/jelinaduwaxemuzodek.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_off0000d946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD946 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15D 10536 bytes
SHA-256: 5efc733cb4ef4f3065ff11ee96a94eb524b45561b09d1c1732519b844276414e
font_02_sfnt_off0001096e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096E 17264 bytes
SHA-256: 47a0f7cd5fb6ad417d64cfe9c9a19385d58593a5bff7e336b6d73f12b44fc701

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