Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71b5c43fea89912…

MALICIOUS

PDF

86.7 KB Created: 2021-07-22 14:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e22da81db772118eca147651b5f3ba93 SHA-1: e0857199550cace5c9a713b877cd0c0692ddb1ea SHA-256: f71b5c43fea89912206497e8893264f9c8c5a744504335ac5e7469b0a6077b3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for further malicious content or phishing attempts. The presence of multiple unknown PDF files hosted on these compromised sites suggests a coordinated effort to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/7907abb59eb477e3e145e9f78f19827f/digumuwetab.pdf In PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/kekexisunesit.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/53030354187.pdfIn PDF document text
    • https://puppometalli.eu/file/fadawizoposidosulo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa4c3a3272---juzavarup.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/01c6f33a54a0bec83b5f62c749a01db6/45838754188.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af6a73ae48f---95028325184.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/govudujisital.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/8c9b7d8e9c531419075f93abb71f1f6e/sujuni.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/47698866111.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/6qqe6nncvgro48eotjkj492r94/potut.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/70554303160.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/6219148688.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160afd89e38ee0---93162162988.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/gututirefakudidajirunu.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e08dbff0ec3---gobojizi.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/3fmtnmho4l91u5r5fva4rk93e0/47827786739.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/mawikebugatukaro.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073205956d13---niwomu.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/22453392184.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073ec1dc9d67---71299424999.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/98499024453.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/fibipuj.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/70932933068.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/27dc6f5e7bb997352a6866ef548e140e/mowikogipobox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=campgrounds+near+lake+toxaway+ncPDF 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_off0000f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10824 16068 bytes
SHA-256: 68fc0b3338cde3395f7f037ae8c0ee9862c5cd2edec6bc3d9a3373fa02c62fc0
font_02_sfnt_off00013181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13181 11288 bytes
SHA-256: f978781be98752beca0870f04788acb9618814dbf2ec081f696d8e73b85827f1

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