Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c23af972cabf1c…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 11:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7478cdc9e4e58ce0c888698d95ead63a SHA-1: fa16d08da27df5c31ab61cf3bbf6144dc830dea6 SHA-256: a8c23af972cabf1c0fa3c9afb22adca1de40f7dd5f447afc3347fe0e0f41bfba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs, some hosted on potentially compromised or disposable domains. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely for phishing or to facilitate the download of additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.propper-droppers.nl/files/file/fasanejeduxinaxadoni.pdf In PDF document text
    • https://amrapalispot.com/userfiles/file/dapegoxilizagivelowezep.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/dogolusi.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/lebedusifenixebik.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4d9627934---99407245736.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/69294511386.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/80421105652.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/efff098e2fd571417f20333a90a5cfcb/45431315933.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/19965663274.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/e6f2f23d7e61d69f39d2dad11ad063d8/nuwadewekowujiwovigol.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/kadixefibovokijuvopetolod.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/42397822532.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/77273345401.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d7f5a88dd---11960652707.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/bagifuvuwuguwufebinixosi.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/19373464136.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/1582144237.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/5473790945.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/vifikiriwutovowovolutezi.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b84d23c6943---fatitusutifat.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/sexugotefu.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/81722174296.pdfIn PDF document text
    • http://proxima-design.cz/files/file/zobojifajeden.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sales+executive+responsibilities+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_off0000de1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1C 11096 bytes
SHA-256: 594d74662b364d9072d88f419876ef00230e2bc7896e0fafdc7b4ec1b696a100
font_01_sfnt_off0000f7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DA 18728 bytes
SHA-256: 17690187e5252c6373f27e78759240f1da18f5cb051312a53c8f7df32c703483
font_02_sfnt_off00012828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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