Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5c179e9d521f94…

MALICIOUS

PDF

74.5 KB Created: 2021-09-14 10:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f9224844c3a525ab6ef18a33893c57d7 SHA-1: 43afb0fb059d8dc21f795f7d7ddf455631d08027 SHA-256: cf5c179e9d521f94dfeedd302f7c396dde476de2b207e16cb92d24247b7349e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous unknown URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://fleuriste79.fr/ckfinder/userfiles/files/32178443149.pdf In PDF document text
    • https://vildmarksjagt.dk/userfiles/file/25416152108.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/93294038677.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/tukexozazugovofutagijaz.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/lizat.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/lareparinefusapobodidup.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/wewalok.pdfIn PDF document text
    • https://kenadong.com/contents/files/95585448921.pdfIn PDF document text
    • https://shidoremicrosys.com/media/57138811595.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8ca3f0986---81107632394.pdfIn PDF document text
    • https://kawanmto.net/contents/files/83777451224.pdfIn PDF document text
    • http://kechengchem.com/upload/files/36773422772.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/86604912963.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/nezugebitufi.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/68163010346.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/86272730063.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/durifofojebifote.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161359e71a000e---xunaf.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/248902b5c749a5aa5bfdbedcd8783316/53066161701.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/c69fc9d03177c50dfa1e0125928d9b15/jitulabibofamekowalu.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/56096771492.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/f02fd70096170553710f1cad0e8e03ac/75104259213.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/tuwudasakovik.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/xugabenaj.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/xixukufuxojefojepatovopu.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/dojoxamawepamofediji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=tamil+live+tv+app+for+pcPDF 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_off0000c315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC315 10396 bytes
SHA-256: c9058d8faa171b6d8ed4340b6b7a8f0e2245506af036073aa59d2bc712aef2ae
font_01_sfnt_off0000da9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 16308 bytes
SHA-256: c23f5eabb962b4bfb1a5855619cc2fc7ed8432874937928b3bf72c96906d1541
font_02_sfnt_off00010485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1