Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f12c6b15303893…

MALICIOUS

PDF

70.2 KB Created: 2021-09-27 15:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7ea520069f01dfe02380c05ab1e8c590 SHA-1: de06131571ceaa7c42ff2cc02ce6cc2fd84def1b SHA-256: f2f12c6b15303893deea2e9fbb89607237805fd9fb2d069435996028805f73f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The document's structure and embedded URLs point towards an attempt to trick users into downloading further malicious content by masquerading as a search result for a technical book.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://infrive.ru/uplcv?utm_term=balaguruswamy+c%2B%2B+pdf+6th+edition+pdf+free+download PDF link annotation
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/3m9qc97fgkknaaa5d8ftghi311/powedor.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/dowaz.pdfIn PDF document text
    • http://186086.com/upload/files/37364048781.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/rujexivawiv.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/44104896356.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305b8a0a277---mewijuroxasamaw.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136928e0768e---zivijubixuwubufokoxi.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139a259564b3---11234071328.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/wexifomevixa.pdfIn PDF document text
    • https://ifunb.com/shopadmin/upload/files/fusiwu.pdfIn PDF document text
    • https://digicpictures.com/downloads/90040513095.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/92789020608.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/gobari.pdfIn PDF document text
    • https://ibericadearmerias.com/file/nagejuvirulevas.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/nomimisoturorujikuwigusi.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210923041829.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135325b8582a---96647666624.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/74866578769.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/vofuzemale.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/kaweluveda.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/vifojoli.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/50286697550.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/fuzonawupirizijusul.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/72564151032.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/66245461094.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_off0000b063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB063 15552 bytes
SHA-256: cf119e3c2f2654de53c5767ed5d03620e68f878b03044f49cee03cb6b3a2a822
font_01_sfnt_off0000d7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDC 11588 bytes
SHA-256: bd7e5217c9f932e698e25e408c6b93bf637a385047c7e0c65a3a1e7fa815291f

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