Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fdc4561e5513786…

MALICIOUS

PDF

83.1 KB Created: 2021-10-26 15:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3a9e5e86ede48efd4e3bd5e520a6fc58 SHA-1: 49003ce03e19064a992e9bc690eea24a4fee4591 SHA-256: 5fdc4561e551378694d6a4e1f34db14c1905488f4310154e642016310f1c2cce
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains flagged as disposable or potentially compromised. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate that this document is designed to host a collection of links for SEO manipulation or to redirect users to malicious sites. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mldom.xyz/web/img/podborky/files/18820244415.pdf In PDF document text
    • http://ksnjl.com/userfiles/files/27694259294.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/74550112283.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/61406164228.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210925_034845062113C9C6.pdfIn PDF document text
    • http://thrs.thriftstorewebsites.net/flash/thrs.thriftstorewebsites.net/file/tevagig.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/62577731060.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eca67cedfb---68716330816.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b2b791273e7a0cda1ea9f16d41df8eeb/misuleniri.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/3078120747.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/zozomukutokiz.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/78363214935.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/d8a26ec6a780ecedfe119ae9cf846ff5/zixof.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/16647787819.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/bonexoge.pdfIn PDF document text
    • http://ladna.pl/user_images/file/sejen.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/72b45cd6dde213a7955339bea6c06bbb/77442904518.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/xifivokolapev.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/87139667484.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/40031897262.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/63049151265.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/zomevuwufamabizorataduna.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/mozuwetawovorevadinaku.pdfIn PDF document text
    • https://simbotour.ro/ckfinder/userfiles/files/41885042996.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/D9plVHj2VOU/uplcv?utm_term=sports+general+knowledge+quiz+questions+and+answersPDF 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_off0000de96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A8 17852 bytes
SHA-256: 6e32a138b6c2fc6575fd7d8972ddcc32789fac38e5eef6ffee6fcdea5c7526cc
font_02_sfnt_off000124dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DD 11128 bytes
SHA-256: b8be193de10c6b992161bb840af9166177f5d3692f9230946c3884aa764ac04e

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