Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1f46e14b57e0a0…

MALICIOUS

PDF

98.0 KB Created: 2021-09-05 16:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 99c4fab37683dbb48d8e93d5d437618c SHA-1: b2542b196ff90cd9c840e4ab359561895270565c SHA-256: 3f1f46e14b57e0a0fad31db7d73dc3f3ed063097399123bf97deeaffd6efbca8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to various domains, some hosted on compromised WordPress sites. The presence of numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or redirection campaign aimed at tricking users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9374

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coiffurenais.com/userfiles/file/fapexowebasa.pdf In PDF document text
    • http://alexhoffordphotography.com/temp/files/file/rivuvukitoxetutewomibuke.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/82070042081.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/pibodupowoduj.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/751ce33ed11eccb72917fa6e2f8f34a8/96449464718.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ringpahc1htoticefh3e0pfa8d/39910023235.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/zunetuzagerepufimij.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/56358c2989cef9b0b8ceb38c9817aa84/voruserozati.pdfIn PDF document text
    • https://termofriz.rs//files/tuzeso.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/69250612275.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/jpc3n95ba250ir4u7mci7isceh/xirir.pdfIn PDF document text
    • http://okvin.org/userfiles/file/madadi.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e41f89a94---tejepebale.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a38e403373---81038913238.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16092b2b6213ef---53556240699.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/27601251237.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/4aga3qnkj106jc0h9391aobfcu/sukolobivefireguriditagi.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/xesavazorotupifubimobobaf.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/jidazikanivokex.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/81425456114.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9be3695ff---54604276502.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/gaxiruvojeganetodinup.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/52539605904.pdfIn PDF document text
    • https://mmszke.hu/files/file/62518310580.pdfIn PDF document text
    • http://rjt1.org/upload/files/59185854551.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/zogipabedebusabufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=chuyen+duoi+pdf+sang+wordPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE944 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000f140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10951 16300 bytes
SHA-256: 5993200286f90b435b84278d9c541ddef25c6e5453e10be5f0ae3cb5d07b3955
font_03_sfnt_off00011f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F96 10964 bytes
SHA-256: 3dfe1c83829d4544d83ddf8a9e14326d26534f2cfb4bb67cb3bb64c550ac7abb
font_04_sfnt_off000138d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D9 25372 bytes
SHA-256: 452a9f7e38fa50de0948288e9c391279376950d6c836778d95bd85b026a451f0

Open this report in the interactive analyzer, or submit your own file for analysis.