Malicious PDF — malware analysis report

Static analysis result for SHA-256 245333de3e27a9af…

MALICIOUS

PDF

94.5 KB Created: 2021-06-26 15:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 997a081eb249b795912720edda15f184 SHA-1: 47e1cc6d7adb0720ae5b32da71f0ebadf2e95ae7 SHA-256: 245333de3e27a9af764ea7636567dabc8910a8e706c87cab52fb57dcc24c2d5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://krisoc.ru/uplcv?utm_term=pet+writing+part+2+sample+answers PDF link annotation
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093ce5bc2d11---97123213583.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/tezumenitise.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/7ef601b5477480b67516532e25996161/29808432424.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9ffc6b0f---4503841722.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/96039898654.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/e11667bdeba4fd8b51c043d60274b4bf/47876047455.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ea11023ff---wazitaweguliro.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/a389c71b90576a4afb6bf76477adaf51/93465424220.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/pexazawirimapuvogizuni.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f537f9ad3b05589f0676732c3133b095/8861251830.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/10343512380.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/40063024064.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/wuvoxipikigivoredumewij.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/8a75fe5648f60b48b2af3d98d0bb7ffd/monezufemukufejupuv.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/4m1t1g6mr1j0elqhhu42de23p9/mupelegufifadokota.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c21597183---49784549377.pdfIn PDF document text
    • http://megalaserasia.com/upload///55593857720.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59f2dc60e8---77948174109.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/2f0a187c3bafbe3acdb5765ebb360123/wofakarizisibarukuvofagel.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a390a7d785---xorabuvolo.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/83096965521.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/bde4038c64272279102a76ee024662c0/82329219508.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/witolapa.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd3eea6839---64720922095.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/xuvoperitegipupivipam.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A0 17528 bytes
SHA-256: 5c7afbff04c0d1a0c2261a7ec4af1f5ca887d2df875a31651df53359b1ccd6ae
font_01_sfnt_off00012480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12480 10684 bytes
SHA-256: 1062861e15e687a5088dea935ee465590e51d8f913a3254bcdf024678f9778e1
font_02_sfnt_off00013d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D12 16984 bytes
SHA-256: 10bc577d3235081e601b1f52b266310c0f0bc2bbec61e98d54027faa472b25e4
font_03_sfnt_off00015439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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