Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdcbdd969197c0da…

MALICIOUS

PDF

89.3 KB Created: 2021-08-08 12:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: adb7af1c1592383cfdafa9ca63e748e6 SHA-1: ed7a2a25698ba502a6f5b71e7da776e0f88c1bb4 SHA-256: fdcbdd969197c0da884df0128eebc73ede10ca4458ab6d0e3998318f4cab088e
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of numerous external URIs and the 'link farm' heuristic strongly indicate a malicious intent to direct users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d02584633b---dasejudibuseda.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a2b17e07e3b25ffaa98b97fec5aad0cc/85889634520.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c954f04484---worekisikejebopin.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/5804265698.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608388f7746de---kabudugagapizepoxenofipir.pdfIn PDF document text
    • https://airshow-bg.com/file/49389479825.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/3de589254c5064a04f74c3d3ad31cbb0/beraxafefukax.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ea86ca9af---bezegizexinijixivuradet.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/18568699412.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/25120613986.pdfIn PDF document text
    • http://flexa.cz/docs/file/lepodesaponi.pdfIn PDF document text
    • http://hogan1973.com/clients/d/d4/d4eda5e2427b34f3a15374adde9a77da/File/55392876652.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/b8d606fcbf9b736e53edb47d54f4570c/2142073764.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/4416849012.pdfIn PDF document text
    • http://asustainable.com/global/file/83616043342.pdfIn PDF document text
    • https://aedwea.com/upload/foto/33841459247.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/gegefuwesudupinazonib.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/papaxudojujevuworekuju.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/xiduribafimoti.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/d509fb2460fd12a1b89a91e598b9b5e2/4228476598.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/cf2d7a4800358b8e9a3d51b6d343ab27/70826590137.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/34800351428.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/36972836126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=education+loan+calculator+excel+sheetPDF 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_off0000f9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E6 10652 bytes
SHA-256: 4234adfdda56f4f79f54a861df711aa2494a7448be9e594e472cd9ed238dcce1
font_02_sfnt_off00012a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A37 16872 bytes
SHA-256: aaa16349748b635e47f1d9d2d9f5f3f0d93e292cd37b538683e16ada323bb8b3