Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e4e14b674a0357…

MALICIOUS

PDF

77.9 KB Created: 2021-09-05 21:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eb05fc597a852254ae02e5fe5b17eca0 SHA-1: 3e43020ea11caaa9a8131cd6b4a1a3a7c4dd6725 SHA-256: f4e4e14b674a03571a9dc879ae1bdeb30a69b11c85bb35d5b0d3fb30aa283f91
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to other PDF files hosted on various websites, many of which appear to be compromised WordPress installations. This structure suggests a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e6041680fde---wodigejalokevevex.pdf In PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/4jecp8t4i320h0v8jr3a1ccvl0/46723578539.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/lojukemovi.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/23370849114.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f215074666a5bbbcba2fc1a25c352dc1/wemav.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/waxebenuxupewamepafof.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/32864842693.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983f94e2d23---97986951404.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16298939379577.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/gawinoxona.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/4d0b64b21ac17dbe3637ab46e9e035c0/xokewowijatobujuzagi.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/wogezurawevipar.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/sunejivakadekebenexide.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/71745133746.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/xowarep.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/toteb.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/zavoxaravegagod.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/6716013088.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/hia6ibl6f1luq6qgt514i0fq42/kusatewuxu.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/didewagevanugu.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/22471606131.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3fm8uhukq1cib925cpsvajeuis/jimurovemorogibupigamezu.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/mosisusutezikel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=descargar+codigo+civil+ecuatoriano+actualizado+pdfPDF link annotation
    • 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_off0000c730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC730 19172 bytes
SHA-256: 8fe19d293e079e8ad3a8e4fabc5ec19d17f020649e895584d5b0d7c680c852d1
font_01_sfnt_off0000f7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F7 11024 bytes
SHA-256: 435fc6345de604017c1812ae923da4b0ff1feac30d74fbce3c7fa5e3c41c844f
font_02_sfnt_off0001119b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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