Malicious PDF — malware analysis report

Static analysis result for SHA-256 816792969f083867…

MALICIOUS

PDF

70.6 KB Created: 2021-09-25 00:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2114799e2f577f05b0e06df280e016b6 SHA-1: c3c1b33f592786808294583a934843753edbf51e SHA-256: 816792969f083867caf259bea50f2bc7fae037db210a85ee9d2c99b7c135e9ee
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://yaqeen-eg.com/userfiles/file/pulawoxe.pdf In PDF document text
    • https://iqrainternationalschool.org/_assets/files/65193674265.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/46577258506.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/bavijokipi.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/gukojegeviragetajinegepe.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/21726487300.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/26386523281.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/55278890576.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/sfssb0oka6nrfksku0l28mgfml/40478035452.pdfIn PDF document text
    • http://www.buildonhope.org/file/74586585063.pdfIn PDF document text
    • http://citranco.com/users/files/kuburixofi.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/lewodutuxit.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/60463045413.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3a2535392---sezedobikolivuded.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef0dbb7fcb---vogizudifutejes.pdfIn PDF document text
    • http://poliambulatorioargentina.eu/userfiles/files/lipubofebajituw.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/24280472800.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/72419512695.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/xomabojobu.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/83ea2a45aca821851e5960ad9ef3ea8c/sizeludatupudafidugogeli.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d58035bb2---jojevudutod.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/gukozulozo.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/sureve.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/dozeminix.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/13972376376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+download+online+videos+in+chrome+androidPDF 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_off0000b224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB224 16400 bytes
SHA-256: d887e6d5cfb05e81e12b8368fc2f3c81a742386f9667d5c388e24c21abf30b97
font_01_sfnt_off0000dc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC00 10780 bytes
SHA-256: a63a205973e2d7e164c1b3480b90355ba4bacdb2a63aa0857520f2c4cbfc16a7
font_02_sfnt_off0000f4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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