Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04669d0a8a17d63…

MALICIOUS

PDF

76.7 KB Created: 2021-10-11 22:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7e0c6385dd2afe551b1a98af3a3b26a9 SHA-1: 1787db337de794a2fc304af382e8c01fcdd0dfa3 SHA-256: c04669d0a8a17d6345264600a7282eb1e84b8cae2b4da5dfea83415cf38811f0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://31kouqiang.com/userfiles/file/1631052052.pdf In PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159f9f75e3ac---99019562472.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/gewovesi.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/483d773e6a98dc744b385ca863a3edc7/nelonukutinifuzapava.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/fobuvutamagoso.pdfIn PDF document text
    • https://vitanov.rs/files/tekegiradarapak.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/81368638667.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/nozoxeginazomojowe.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/xegumafiwopekix.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/11977784312.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614f536d6f115---98902962770.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/rogewukagupes.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/tafamawunakiko.pdfIn PDF document text
    • https://paradigma.bg/uf/file/74868413394.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/rupolazumunumutupefe.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/61021309828.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/77567361677.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/pawejadesojulapa.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f2b6c63cb---rulozemekixorori.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/doliriguril.pdfIn PDF document text
    • http://kngsm.in/userfiles/file/12358297969.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136a415d8700---fanubilopud.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6f8c402db---jozexibulug.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/TxADE9PCSUw/uplcv?utm_term=resmed+s9+escape+clinician+manualPDF 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_off0000c42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3D 17840 bytes
SHA-256: 12fceaf1a80c3de80f9cbec3da072594c76595bb3acbc83e413ef8486203e8fd
font_02_sfnt_off00010b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B08 10668 bytes
SHA-256: dc9d6ece1bfdc045bb0f0819329ea8706105b06b749598be9ae7aa91cf2868d3

Open this report in the interactive analyzer, or submit your own file for analysis.