Malicious PDF — malware analysis report

Static analysis result for SHA-256 65cc6e382bdde938…

MALICIOUS

PDF

85.2 KB Created: 2021-07-07 04:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 51d21e655bc543888271ca5b6f801bdd SHA-1: 7c03e2a8705909b84bdd8cf75e6f4965fc515569 SHA-256: 65cc6e382bdde93889127b8261e348a9d1a60edd8044e790f5f8e9a5256d3ea7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://gyndoktors.de/ckfinder/userfiles/files/52739087927.pdf In PDF document text
    • https://b2b-intelligence.it/uploads/file/33749366266.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/xexixosogupaber.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/23280115669.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/zixesifuvoron.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/01759a2f2b8f779d87962814470158c8/16239741055.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/gadevejof.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/8faad1c1826165f3fac7566b283acb7b/8373297851.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210616003801.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aedd132fddf---73144283675.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/fazaxisaruwopalulixon.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/0ca25a45efefbe5bb24dbb765f32b207/mepatax.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/verereda.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f0c882221---41321290875.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/17321738682.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/597b7a96fdd60d2b010d06cebe502dda/fazunakomajukeniw.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3067b539d---josaputolalufufaxuze.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160741eca3368d---56863106700.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a597df15842---jevaweromojiduxuwukedexap.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/zupamevajoten.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86ec2275b4---vizunalijo.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/fegapejezonuduna.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/7994d39cd4b02a849cc611c2f9d8048b/81568353665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=hb+level+in+bloodPDF 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_off0000ed09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001051f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051F 9908 bytes
SHA-256: 5aa9373abd8f0660e44f377d27eb2dfe1bcf9f07ebb925ca0c8445ddfbdac68e
font_02_sfnt_off00011af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF4 17176 bytes
SHA-256: 85007b130b11d046d89d91cf13ba66648306fc119ae5b91bbfb7b76c5d93c343

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