Malicious PDF — malware analysis report

Static analysis result for SHA-256 98dc4aedd830d8dc…

MALICIOUS

PDF

77.7 KB Created: 2021-09-27 23:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cbb4a43460ad75853be40819a53de7bb SHA-1: c17d8a807064ebb441a2bb05d465457d2ce8bd6a SHA-256: 98dc4aedd830d8dcbafefad37bd4cdbd18a90a30882dc935e441703dce5c0d2a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Heuristics indicate the PDF is part of a link farm pointing to potentially compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://studiotecnicodambra.eu/userfiles/files/48122237546.pdf In PDF document text
    • https://callmarkinvestments.com/callmark/files/97363544178.pdfIn PDF document text
    • http://health-bridge.in/upload/file/zeniresilalaba.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/kixiwi.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/835400071.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/60219417909.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/jinufu.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/sosokibeju.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/xovelirilagej.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/78027082703.pdfIn PDF document text
    • http://debten.net/UserFiles/File/14408910715.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/69224748155.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/20542769087.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/161468e5d7c2aa---tutulipepilas.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/68928826428.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/93275101257.pdfIn PDF document text
    • http://mosjob.ru/images/file/xisawo.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d6aad1fed0---9150384526.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/nunuto.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/pipezaze.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/36348228546.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146772a64ac8---32202627612.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/17715104654.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/fofunokuso.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/vofusikizatexoniferij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+make+a+song+ringtone+on+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00010fc2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10FC2 17048 bytes
SHA-256: 35177c8741e040eb82ce776c3e8cac8f955d28b610a67e6774fb357428b4a08c
font_00_sfnt_off0000b3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E0 16952 bytes
SHA-256: 49bafb460ca046b959114ea09e1cfcac522ce2a2263f971eda2820ad028f2fa9
font_01_sfnt_off0000df48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF48 10716 bytes
SHA-256: 7ef639df6b1ea3cd7e224d1130f761fa46440f2404f754631f8662599fd4bb32
font_02_sfnt_off0000f7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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