Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb02108f0437018e…

MALICIOUS

PDF

91.2 KB Created: 2021-08-22 01:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 302fd7d9770e3754e0df1b4a58ea21f5 SHA-1: 8da6e4b19df8ec6cc920f3e6254f3b70e37d86c1 SHA-256: cb02108f0437018e3016894c141cca34115237aa8e1264fccaacb7b4cb456307
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute further malicious content or phish users. The presence of multiple unknown URLs hosted on disposable domains reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76cc85e355---buluzuvigutaregixab.pdf In PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfc8a57307---4284755639.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/7126998852.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/zifenujasutatovexaregalup.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/difvsnc90g0s6scllivakt4dhq/jekivigibolajugude.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210623_180C7CB642E898F7.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e29bdacea3c---87707733690.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/91628397611.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/45437360530.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/xamumezavi.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/33331991021.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/f395be8538d49ffd0a09cf16819252fe/54466463804.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/89218236528.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943573b8231---84356480679.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/94494927967.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/38550145351.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/rajotajezub.pdfIn PDF document text
    • http://deauville.ru/files/file/77992529107.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/fiwoduviwor.pdfIn PDF document text
    • https://egca.fr/userfiles/file/55561710786.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/faa95f8fbb713ec4f8eb4f58ce12a37d/80585441130.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50e8609e94---wotowafik.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aef2e43055c---90791022728.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/sirafawefetufubu.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/91778885912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=wind+of+change+all+mp3+song+free+downloadPDF 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
font_00_sfnt_off0000e6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E6 16572 bytes
SHA-256: 10d4925417e37f6c23b131544a204866a577b971cfa6ca9f8ed3241c4deff9f7
font_01_sfnt_off000111b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B8 11220 bytes
SHA-256: 76d500b4a5b93bb5395c8baa36ea81fb21ead540dfb778d3a8cb0e700ed508ba
font_02_sfnt_off00012b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9C 17624 bytes
SHA-256: 7356da1db74a3e5a3648806111a8d3d75ad025358e206fec1f52fd4275bfad76
font_03_sfnt_off000145b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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