Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f30c493ee94895…

MALICIOUS

PDF

72.0 KB Created: 2021-09-03 06:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5038a131f661a6fcdba4e61d515b4d2c SHA-1: f7311d7d17f6a8151db45a90dee5c80ca8d0b3bc SHA-256: 25f30c493ee9489553cc61b1f70bf8681f46800b58e3cdb06e7b97f14d14d9f2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites. The presence of these links suggests an attempt to lure users to malicious websites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/044bba577f5e1319088cc956121ff58e/resolikagudilizokavefakef.pdf In PDF document text
    • http://curry-box-deluxe.de/userfiles/file/lazulazapefanuri.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/54371976096.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/gs1qi7p70o9v0lefhek08rhg72/24982072029.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16106211f32c5c---bekonuj.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/getidafekifazavo.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/c68592bf69b19d6b3e1e22aac6a66731/davuf.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/70350892686.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/98412647942.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1def8dc28---71320587762.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/4543854455.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/munisufe.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771e9f9d1df---mejaditelemarugijiratewur.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/59347692298.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/sumasinin.pdfIn PDF document text
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/41824255011.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/74708650146.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/26141996090.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/58ee4d7b533e71b6d986e9c9057e9b5b/wisezok.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4dcd23def---gojuvudu.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/mijusudimon.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/42167740595.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e8a822e26---lofutonivosexadenokige.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/eu3f9ee19f6b5d8lp6of28s7i2/381536956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=heavy+metal+toxicity+introduction+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e43cdba1136---sinesexogedade.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_off0000b9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D5 10988 bytes
SHA-256: 91297e67873ac927bf191ee13b2a4874970de269823b053a7ba851e84239bd12
font_02_sfnt_off0000eb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB45 15208 bytes
SHA-256: abb26058a8b4653b2bc2cf620f6caf4debe18e8010f2621e48a885da5d19cf08