Malicious PDF — malware analysis report

Static analysis result for SHA-256 3523044c74d4f55a…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 17:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 21780b94afc596cb416d2eade89ea704 SHA-1: 81ad2e8865578cb924a8c20d47d78b3603ef87a4 SHA-256: 3523044c74d4f55a419490d53280d239ccdb524825b9c38a6bf20a90f07f4227
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised CMS upload storage, suggesting it's part of a link farm designed to redirect users to potentially malicious sites. The presence of multiple external URIs and link farms indicates an attempt to distribute or phish via these compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=websites+for+watching+live+football PDF link annotation
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923542d1992---kobemifogazavedo.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/wuponomubitaj.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c75e04c53---34576045480.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/wasopu.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080c4da75809---36671213951.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/xogofo.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/tufixomuvor.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3b36020f5---nogejetapi.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161044ee203455---garovat.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/35196898296.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/paduxobavixod.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/rikotijuseruxafawe.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/58801932582.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83f47ca87---gifubuvokuroxozokipobe.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/fc6c3b25844d3aba8491d5875283d10f/24455425285.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/tejekowekajejose.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/47370139358.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/89107203765.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/0081734681.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/60153054454.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16084453b0b115---14024628434.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/hivva1tv29t2q78qsm97q06gej/12336444371.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/kogivat.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/k8otc5aneuaipblpomue9brsqs/65992975491.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_off0000dcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CC 10900 bytes
SHA-256: cb85f28c58521629e628e308c74c1f3f780cac32308857f6e4a2f70625e38c33
font_02_sfnt_off00010e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0C 17440 bytes
SHA-256: 3fcd063330d4baac1af797e9d0c543e43b1d3079c533b6da2d8d81da0603502c

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