Malicious PDF — malware analysis report

Static analysis result for SHA-256 714c736f03dc440a…

MALICIOUS

PDF

88.0 KB Created: 2021-08-12 14:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6d1f7ed89ae16f7de32bbe87611f248f SHA-1: 25bd9e8bfa8978e7609d718731c8fc0deaeab4be SHA-256: 714c736f03dc440a5d7b52d2b033f4cbd23d842a4caa6f37acc6ad1044a698d1
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://daonshop.com/files/fckeditor/file/39455928118.pdf In PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16090d941314bd---76164065106.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/8f91692d657e8aad1ce7724bef03acef/rutixemoxo.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/43125880373.pdfIn PDF document text
    • https://x-software.cz/data/file/53820781230.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/00f60eee202495075eb9507f5b6c6bd6/90281639903.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/wamogepovaki.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/34913089196.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/45ac5689af53aae9a4d25095bf255eab/40294472507.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/14098522914.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/2vs7n5386im7pphtn2gt04kfkt/zowatitiwavumexajomev.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/45130754224.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/zusibuzofiwubakes.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/13438866674.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/bujizetit.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021070211293141.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/54917140609651797e7ec.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/zevuduxinojapada.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/4135b19d72db9ba4dcf2d0385e6ab3cb/vogasojazu.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/balololi.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/17838964516.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/dk58d5liuptftu1dr250777960/83521215328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ejemplos+de+oraciones+con+articulos+definidos+e+indefinidos+en+inglesPDF 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_off0000edfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFB 11176 bytes
SHA-256: 43800c80271e4d757e16abf35ff3ee7372800865be3e0c61e184c4f83b197c60
font_01_sfnt_off000107d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D3 18424 bytes
SHA-256: fd51ea93d87eede11974f774b7d7b505eda1101695a894d45e96f7716430e7b8
font_02_sfnt_off000136ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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