Malicious PDF — malware analysis report

Static analysis result for SHA-256 f090cd910863d878…

MALICIOUS

PDF

83.3 KB Created: 2021-09-21 09:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d6b2314796f003b1e1bd3c9d6eec93a SHA-1: be687a3362613f56e1e6538988d20f30aad4461a SHA-256: f090cd910863d878a63a5b816e1a37e484aef7241842ccd7dfb2bf30c10bbc99
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, indicating a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document is designed to trick users into downloading a password-protected archive, likely to evade initial security scans. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://hdurmuslar.com/images_upload/files/motatenufidefatiko.pdf In PDF document text
    • https://businesslife.com/content/files/sifiresaxewanomemasezi.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614205552cc19---80247783308.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/motofetinosukavupugowuvo.pdfIn PDF document text
    • http://primaneighbors.com/userimages/kafarepita.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/67175198346.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/dirarapojomuris.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/70055399410.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/30456832973.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/v6qeq51bfqhk2khdukjt2t0lf9/29952606157.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/nedajekive.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210905_758500F3CFEBC2CC.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/disowikolijikija.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/fubuzopaferovejoregot.pdfIn PDF document text
    • http://diepdoanhmetals.com/media/ftp/file/66029955036.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/jafuzosumamatizewe.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/nefikut.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/medufikepefuviborodifi.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/wadawojupeteku.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161421aaa3dd08---ladajejit.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/basibaruxowirobakob.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/68970843738.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/jipobudibimadi.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/pewatukunirijesi.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/36223599382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=descargar+fotos+de+facebook+en+androidPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/novetuxinu.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_off0000dd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5A 10836 bytes
SHA-256: 4c215eed24f3d366197e2b878eb0ee36084c7c5061e00b2a566d9bafe4f95277
font_01_sfnt_off0000f656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF656 19212 bytes
SHA-256: 9f7f40d415477bcbdce9054b162583de8103319e3c3bc166283041c908a55bec
font_02_sfnt_off00012732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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