Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dce175ab5e817bf…

MALICIOUS

PDF

82.3 KB Created: 2021-09-04 21:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4926ef35b6b4521ad3cf0ea68b5c8b10 SHA-1: 3be1e4a753d7805f6766b53e9441f2bf3c38f1d9 SHA-256: 8dce175ab5e817bf1fa28cddadcfb628fed7cd08e6348de38d61956a32d56d07
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farm heuristics points towards the T1204.002 (Malicious Link) technique, and the nature of the file suggests it could be delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://blfimmobiliare.com/userfiles/files/fudale.pdf In PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3bf4dc2cd---12090604718.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/tojis.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/tozowebovinomaxufowufa.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/2293984967.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2a9515371---rusip.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf7299875---11608284322.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/335f97bc5dc031cde376b2b2338d7c3e/59184087797.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/89fd15bf9ac2462ca9704c2fc393f308/59707069576.pdfIn PDF document text
    • http://poorclarescork.ie/images/gawebil.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608be97f889e6---fenisibeziludinugamokarol.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/10777690372.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160784d9655717---95686831531.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/6ul0r3lh5kbrjcv05slogsr55b/69144386070.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095547438a77---10377438506.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/jitarivuwiluvixij.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a142305f0---2319835301.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/morixelidexodudenipuwi.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/dc8f522505205d3156547749a1e3e2e6/dilofonus.pdfIn PDF document text
    • http://tyextractor.com/d/files/mikefar.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bccdb15796b---gatonewetavuwidikegudi.pdfIn PDF document text
    • http://tochuchoinghi.org/files/xakibilakewiripe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=metabolismo+de+los+carbohidratos+bioquimica+pdfPDF 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_off0000da45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA45 18592 bytes
SHA-256: 5fc56314dd5decbecbc4598e13be6d5d9944fbfec12ec6d97e492c93ebfbc3db
font_01_sfnt_off0001098d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098D 11160 bytes
SHA-256: 98c1b46210d1cc3fe4f46abf9b122f9ee3d410f7b08d74bc523b278c0a18f789
font_02_sfnt_off00012330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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