Malicious PDF — malware analysis report

Static analysis result for SHA-256 51cdccab9bfc4fbd…

MALICIOUS

PDF

73.1 KB Created: 2021-09-08 07:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 264034161cb972f6734559eba41f5447 SHA-1: c8a937ffd2d121b39a12795956617b640a12be38 SHA-256: 51cdccab9bfc4fbd1459076f9414b9d48d453959109008b1d04480aec8ad2c6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/e7466dbb52ec1a58927cf61b322eb15f/xezuwejikageveno.pdf In PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/rgl50dnivdq7c3tvhq98aj8mi1/24918238611.pdfIn PDF document text
    • http://klaaswester.nl/img/file/divobo.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/minibalivumuzoselodit.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/wolododijawufapepepago.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/72335039059.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/94551821759.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/12900284808.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/2844f7ecff0351a4116c30d5c9aeabef/77359795539.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ce4b08b61d5aa4eaeb666bac2332a9ff/botuje.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/42698411638.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/dasinakuroluvupoduvone.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/22885678938.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/67943244718.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/jivirewosiboguz.pdfIn PDF document text
    • http://frappsreagent.com/upload/files/19078986825.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3c5732873---7054500148.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/pagoxubixovapimuxigova.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cf7a29b560---14932779553.pdfIn PDF document text
    • http://leton.pl/userfiles/file/kotutonisowimurenaje.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/denuladaxafebumuw.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/32941715095.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/lerajuxusozudunupez.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/titatapuraliwikunozafafep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=thesis+survey+pdfPDF 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_off0000be54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE54 16244 bytes
SHA-256: e6927b5af9149deb1a063c2b9a70800abdc575b342b5cb16177e02ca5c711d58
font_01_sfnt_off0000e797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE797 10308 bytes
SHA-256: 158762b9cabde6423c3c43a447676f316a84ae466fb9acc349ce9493fa19d1e1
font_02_sfnt_off0000fef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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