Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bca18ae98fb846…

MALICIOUS

PDF

88.1 KB Created: 2021-07-03 11:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ff6144df732553eae548bab4bd2d41a7 SHA-1: b86313836231cfcc910aa3be8c5aa797f8620219 SHA-256: 90bca18ae98fb846005cf3111fe774bedb33e8d4c734c79b89733e562d3ce812
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://asfalon.com/__files/file/kidakokabifepigib.pdf In PDF document text
    • http://icmasistemas.com/userfiles/files/delewudezenulatibifixabos.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/53239296202.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/41b9beb70eb335d8826e3023c49373fd/20479339273.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/58809544893.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/78272309508.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/nupivexa.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/vajowebavuturu.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/638a6c6cd0647dc8a41bb2dad563c422/77720553352.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/55649017984.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/6558edc752c006d2003923c233cef4dc/wutosobolojupewerenodafo.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf4c31594---92114651505.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078476ba2d17---ponitelulumotuvuzosulivu.pdfIn PDF document text
    • https://coil.hk/upload/files/pamuwu.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210528_376E1B54B314E9DB.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bdmps1sul0tfpik9nu5s3f3kr3/46399101047.pdfIn PDF document text
    • http://geose.ru/userfiles/file/nefilupe.pdfIn PDF document text
    • http://apsons.eu/files/file/81331340698.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/65606700911.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/36864896101.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/rmgfo75ore08guot4hm1k4hk5a/susim.pdfIn PDF document text
    • http://hnspkjx.com/d/files/90208927637.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/lezurejopepon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=every+witch+way+but+loosePDF 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_off0000f464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF464 10712 bytes
SHA-256: 7490d9590bbd2238289545ff607c5019acf4994eff537e89bedbcb1f0e5653ae
font_01_sfnt_off00010d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D30 17516 bytes
SHA-256: 7d08c33a8a8e26bf05001e208cb81da61ad0549bdd7564904aab14102402ede4
font_02_sfnt_off00013b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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