Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f7c2c3f240da02…

MALICIOUS

PDF

70.5 KB Created: 2021-10-01 17:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 34086e0d9981e0d1324387bbf8372707 SHA-1: 1fb601e050f30ef44b457eb89fbee9b714248864 SHA-256: a8f7c2c3f240da02a51ad6a97766a9c7e3a32be81ba19c3951de13505e187077
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories. These links likely serve as lures to trick users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3122126b5---kanogexozegamuzinan.pdf In PDF document text
    • http://cuacuonbinhduong.com/upload/files/foses.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109080610386456.pdfIn PDF document text
    • https://csodamalom.hu/files/files/61896511234.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/fuxosopumonagojewofapev.pdfIn PDF document text
    • https://yellowstonewildlife.com/49194922726.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/73745854888.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/38205668806.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/risamuja.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/bodomawefodofaje.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c0c0c1702e---ganepisow.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/jedewe.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/jemaforusesuwibimajofe.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/livijijovomisemukitiwis.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/94390940103.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1615295e2f312c---gifoni.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/45906007385.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c99eaf817---18550141658.pdfIn PDF document text
    • https://pellevah.com/upload/files/pixigiduvifugudeg.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/57556534593.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/daroberavavuxofutal.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/komutov.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/zifezabatevelovolu.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/88681447193.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee23d21ee0---dotegelazojafowik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=breaking+dawn+free+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_off0000b25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25F 16584 bytes
SHA-256: b29f413fa0512983d74421b790def8805def97923e7d8abe71c02dc76290780c
font_01_sfnt_off0000dcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFF 10472 bytes
SHA-256: a96bca5a583ae86ca28bcfa7c8b51c3cc7957eb4a718290f5ab6daa95e1cc590
font_02_sfnt_off0000f4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1