Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc149099228e7f7e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 21:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 775346ece9accfaa903c8401c7f4cd0e SHA-1: f13d7d79d7ba0b4cdcabdd23edc1230956dc87cc SHA-256: fc149099228e7f7efa652517809bcfffb23c81991dd37f5640fe2f88ce11bb8c
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, some hosted on compromised CMS upload storage. The presence of many links on disposable hosting and the use of UTM parameters suggest an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://shriramsteels.in/public/ckfinder/userfiles/files/guvumibexuxo.pdf In PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff1605bbea---79752965494.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/tetiposav.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/j58dg2jo5jaeogmh1m7u9eteg6/343130397.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/pbc9pbqlo752g9m73hcp4qs1vk/91207154459.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/51659212507.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/91865061521.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210908_979E2714E6558DDE.pdfIn PDF document text
    • http://irinabailey.com/upload/files/71858501021.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/16121441357.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/52069224881.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16137602b86e36---roxenabogipuwalesadixeduk.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/dikokawiwiginelululisaze.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/taxekofakifelopuxoja.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109081248315065.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/fuxirebefaxulog.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/60266105099.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/topegakizugorusuk.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/39385637176.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613075b067452---demipudut.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/20539134907.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/sawiwigedogax.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/wotarerikasokibuzuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=qarib+qarib+singlle+full+movie+free+onlinePDF 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_off0000d8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 17480 bytes
SHA-256: d4cb197637330077772d15eca1ebda1a1834c47101fb39ef570c0614ebc76761
font_02_sfnt_off00011d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D67 10972 bytes
SHA-256: d9f6815ddfc11c9327da4db6a2466d84843a40ba3b668df61cf60c7ff4eebd10

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