Malicious PDF — malware analysis report

Static analysis result for SHA-256 664e4e2ec85a0e2c…

MALICIOUS

PDF

70.3 KB Created: 2021-09-08 18:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e6be76c200e5f43cd103df92096630f9 SHA-1: fd6148c251e2304f96d6bd1fa9d6ae05286ef5c4 SHA-256: 664e4e2ec85a0e2c4eb13533b2a33b721e492c5b260560374078ab54302b8f4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smarttechsolutionukltd.com/uploaded_files/userfiles/files/11636971174.pdf In PDF document text
    • http://ahnil.com/userData/board/file/32118485893.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/zuwadevadunepexezijoja.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/11550045806.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/zaluwiragelefubofi.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/botaxuxudisovukodeduwod.pdfIn PDF document text
    • https://digireg.li/upload/gifet.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/nuporobusi.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/4c045477592d4d2d8a9f428e97649592/52373072265.pdfIn PDF document text
    • http://e-sportis.com/images/upload/galofuwoseroxolaluwesa.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f25071fcd---72109318252.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/sabopoxuv.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/56925872191.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/nabixarovekalejiduduvob.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/gaxapuvugef.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/94201441311.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161362ce3dca77---21474465258.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/73760562014.pdfIn PDF document text
    • https://clubon.top/uploads/files/40611878131.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/76484217826.pdfIn PDF document text
    • https://visualarchive.bg/files/71760114087.pdfIn PDF document text
    • http://liyangah.com/Upload/file/5952484178.pdfIn PDF document text
    • http://meuseguro.top/fotosempresa/files/69957693507.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/gakefidekejusisomomipawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=plant+parts+worksheet+preschoolPDF 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_off0000b4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BC 14864 bytes
SHA-256: 49b9d2c42881d92374c03d3005bb8e9c40488460ff5be811dc2482f5b50c0c85
font_01_sfnt_off0000dac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 10560 bytes
SHA-256: 079338febfda01ac297230737d89ee1e86c9e3bb63d57073949b362178e5e651

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