Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab24c4d61824bf50…

MALICIOUS

PDF

83.8 KB Created: 2021-08-19 23:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fd5707ea1b887f15fb5e1a125cf34de1 SHA-1: 1d8ff5a23b35ab9778b5b792715422cafd21b254 SHA-256: ab24c4d61824bf50352f668c45f6de17a0b14dbc03e4d261d539ee079f32e24e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised CMS upload storage, indicating a phishing lure. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://inbjnews.com/data/cheditor/0603/files/99017257030.pdf In PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/mozetotowuderowowaroze.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16115b563844b4---zisexijinajenib.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/67i04imvqmjngspdv6e0ankcbj/30160017210.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/murofa.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/effbc54f2535073d56420cfade47b733/tizuvi.pdfIn PDF document text
    • https://afayl.com/userfiles/file/45458261439.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/4119201d26efdb76aa8929b957566ef2/62454151007.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/d401403f0b8a90df3a83e651c4e88a23/10110267839.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/18124895454.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/rojobaba.pdfIn PDF document text
    • http://wenxuezj.com/images/File/13363489804.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/28648619818.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/beruw.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/bofemelorajegoduzesogomer.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/jenelekemaderejir.pdfIn PDF document text
    • http://wirheiraten.de/images/file/dutetusajegesagi.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/lobokunujesisarivurup.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/24378958149.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/71730888204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=are+sat+practice+tests+harderPDF 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_off0000e61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 16672 bytes
SHA-256: 3814311df4a6020a3c39add1eb3c69b3e4013330aae7f2024a3c5abd0a868019
font_02_sfnt_off0001294a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294A 10320 bytes
SHA-256: 873ffa667d0b221a214cc44368a0ad6e0ee9493d87fa7e2169247e29f66d3bed