Malicious PDF — malware analysis report

Static analysis result for SHA-256 eecedcbff8e7d152…

MALICIOUS

PDF

74.3 KB Created: 2021-09-04 03:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 16557a5b7948f40b865e51de0f2b20fb SHA-1: 143b2fedd384bdaaba518234711d56f7f72bbb16 SHA-256: eecedcbff8e7d152a9aaf2ece06683d3b9b3a1a2c36669d6e21422a06cee0473
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://alshaabcoop.com/userfiles/file/53826348820.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160891dcff2832---vidor.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/76609658391.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/wavevugupemezenanos.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/biwevo.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/81254234046.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbf1c4b1ca---17127778162.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/87993853210.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/kowonibitelumunut.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/12325197344.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/wuzupumutapenajitunibofa.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084bc1c8b18b---rudelaxodomigutavur.pdfIn PDF document text
    • http://c-amc.com/upload/files/1197019744.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/vuzajidul.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202107/file/vekunoxap.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081f18367330---depusanibefedozawunoruw.pdfIn PDF document text
    • https://wsbtitan.com/images/file/dirameminagi.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/zinepubikive.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8ead623f5---zajewis.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/15319047260.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a42fcbf82---pobefetemodolujavo.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/gifunogawofogev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=flashlight+partitura+piano+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_off0000bf1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1E 16928 bytes
SHA-256: 4722c34eb1454e0c69bea47ca47e199ad11bfe85e9f75325c12a61c7c56e3f8d
font_01_sfnt_off0000eb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2F 10720 bytes
SHA-256: 3672de105a1f3e404c321322da96346f6ef09814304e695b90fa3aed0ceb990c
font_02_sfnt_off0001037b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1