Malicious PDF — malware analysis report

Static analysis result for SHA-256 9572718e34670674…

MALICIOUS

PDF

83.0 KB Created: 2021-09-24 07:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ddf57a06a5377474da08c8521522581d SHA-1: 6adf0996f8b706ffe3da47aec91470ea7e3906b6 SHA-256: 9572718e346706740087186a85d688d36cbe71f1c8cb42ecc8ca9e9fcfc4dd03
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to IP addresses or compromised CMS upload locations, suggesting it functions as a link farm to distribute further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document's purpose is to host a large number of links on disposable hosting, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cructi.ru/uplcv?utm_term=apps+for+androids PDF link annotation
    • http://140.121.161.111/ckfinder/userfiles/files/wexikajesuri.pdfPDF link annotation
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/wixibikoxisiliwefedejonas.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/97303997271.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/wobopixomanapegij.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/basusesavuwubusiw.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/fuzetibegarunafiludobufu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6a30b6db3---welurotegupevopodil.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/52880215222.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/qep5f6u4jimo7hq5cj5ibjhuis/juzenewiserevote.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/67111516713.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/117f99de34f93e9edf98e7e6995fde84/87847784772.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/gekozonitarafe.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/89776560989.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/72579367409.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/dcf27248e12cf876cf2ea686f40b1e5c/39349087603.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/jufinukozeliki.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/56494458496.pdfIn PDF document text
    • https://banifatemeh.org/data/file/29264246357.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/zexugogiwulelamowinawaw.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/99463492625.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/94998604289.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/65673863192.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/20816274622.pdfIn PDF document text
    • 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_off0000e19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19E 10196 bytes
SHA-256: f001846eb3c7c910bf9a1d3ce5c96a8097d4b72a1be5d3e819be18bde690fa18
font_01_sfnt_off0000f888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF888 17880 bytes
SHA-256: 5396a1b3b2f718ed50bddf68e1eaabf7f5e77ffcffd10a0dc520c72051342277
font_02_sfnt_off000126b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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