Malicious PDF — malware analysis report

Static analysis result for SHA-256 e166378b8a08a87e…

MALICIOUS

PDF

87.0 KB Created: 2021-07-01 15:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 93a4e8b0b7ca00380867fd2ac8b7ac83 SHA-1: 938f9b15b9ba11fc64f8277705abda9227d2cf30 SHA-256: e166378b8a08a87e049fa696b22a9ce13b7d8f61884d78389dbf4d011c825d1e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

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://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/pd0bevgaf72b7uj7d9dnugr9lh/93481572102.pdf In PDF document text
    • http://hanleyresources.com/images/megalakofopekigeji.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160802e34cc42a---lorepunoxovibemizulazowop.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/zizajejiz.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/xelikalavosuxex.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070bab2a3e6b---99191316514.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ac6d7987a---20296262598.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/904103705bd169bb28d8732497495542/novalefejewitaza.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0a2052eeb---jubokevusu.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/fonibufojasemewafa.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/manedi.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/berolomoto.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/l9g1i7u4ndb5mge0i7kk29p7e5/wirox.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d028e3c4c3---tabenasisetubumuxidutes.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/67341454545.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae44ea7d62f---33665308715.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/92fb6483utqbl7trlt1jg8hp84/16229414794.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///laxupolexotaroxejogexanuf.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/kefidelofodarunigugir.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/16287177470.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16f173df52---kuledufalivutapodusor.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/kasozevabaxakuzamot.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/c3cd46ab2401548c9f68ce98896f8ddd/87789742547.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160acd620985d1---51838867043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=yugioh+spell+card+templatePDF 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_off0000ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 17844 bytes
SHA-256: 6bcb64e081c6dbf69d782d770091e049f5781918c021b4f55a2dc865dc7996b4
font_01_sfnt_off00011c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C42 10940 bytes
SHA-256: c6c3ad9ef97c7329094e904aa29a7fea6b151833cfd74e8277b978ee33acaca7
font_02_sfnt_off00013569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13569 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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