Malicious PDF — malware analysis report

Static analysis result for SHA-256 96ecd846f5065b80…

MALICIOUS

PDF

78.4 KB Created: 2021-09-18 15:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c19a6c82c11ec2cf0b230a8b74718780 SHA-1: cfd1897411aa0a63745540aef0de1ea5ba571628 SHA-256: 96ecd846f5065b80d0e8aa0e6ea0ffbe9240e06c4d5f35f651581c3ed546fc3c
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://coretry.ru/uplcv?utm_term=a+concise+textbook+of+pharmacology+murugesh+pdf PDF link annotation
    • https://simon-daulte.com/ckfinder/userfiles/files/fumaxakod.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/67746800991.pdfIn PDF document text
    • http://elpijisystem.com/file/donon.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/80995519550.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7759d8fe1---rutarexifazixiso.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613735efa89e5---bulum.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd1b8e2cf7.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/kujigemidupamomekobugiz.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614096ced3723---82778056200.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/49967645705.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/36967762122.pdfIn PDF document text
    • http://myphamasia.net/upload/files/robopa.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/diragitili.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/pabugimusutenik.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/79979164102.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/28237808043.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/094ecfc7bd3a3cdf48acf488cb6a22c9/21904501145.pdfIn PDF document text
    • http://analhospital.net/file/files/resakorupavatofuvasepo.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/72603929288.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/74440548911.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/fafute.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613238a2b8048---gorixoxulezazopuzololig.pdfIn PDF document text
    • 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_off0000c9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AE 18276 bytes
SHA-256: a724eff0876ff6b98b38b5eeff7309c742c24b45b3ecd5bc8bfc5a9e1244a7d7
font_01_sfnt_off0000f8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C0 11596 bytes
SHA-256: 1fa5a7c3de3d7a50963d22cd4d17e26dedbb8abfaf7dea56036dc166e559422e

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