Malicious PDF — malware analysis report

Static analysis result for SHA-256 1816c6ee4af0361f…

MALICIOUS

PDF

78.8 KB Created: 2021-07-28 13:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e45de57102ac42bc17079af0d81db3b9 SHA-1: d70a119e4469cbf08aa0822b55d6e0f85fd1a4f3 SHA-256: 1816c6ee4af0361f37479d0a62477af49001f00ba72195d24e4d2a4ef528a1e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing attempts. The presence of external URIs and link farms on potentially compromised CMS uploads indicates a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160f4c42fe7200---xejoja.pdf In PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/5a2c9f5a0cc2a45f6682dfd0ef44cda5/puluminizekawoli.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/67700465018.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c995fc95fa6---vixatod.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/52707814253.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/63858848999.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/d8878c2122d33305e99ac057653c9140/28651522674.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/51643997908.pdfIn PDF document text
    • http://masonhn.com/d/files/pezus.pdfIn PDF document text
    • https://turbooto.vn/upload/files/62722282081.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210709010523094.pdfIn PDF document text
    • https://red-adlay.com/upload/files/nuvigugibutufajokekiki.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/74639810988.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/46709239881.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/zaponiru.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/92955693377.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/sr6i2qromak3vmae7r23io8mqs/17067076222.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/139391539.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6a250a350---29029905980.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdb0741c06---wilepanogiwe.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7b5d778b6---58998537188.pdfIn PDF document text
    • http://carolinaboatclub.com/userfiles/file/zisaluwag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ifa+iwe+odu+mimo+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_off0000d5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A6 15940 bytes
SHA-256: a82087d001903c739887cca262e36cdcad31d2b20b18bbe6677cf65bd38f976a
font_01_sfnt_off0000fe23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE23 10280 bytes
SHA-256: 2516b2c36d45de97aae936562b1f7d903316273842f1ca5a030cfa29d685e606
font_02_sfnt_off00011550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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