Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfe0e2170f23af5…

MALICIOUS

PDF

88.5 KB Created: 2021-08-10 09:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: be68c255454e9e3e83afa0444360d992 SHA-1: 83da774e3d725035ec975ddcfe33fb0c8ae35d22 SHA-256: 4cfe0e2170f23af5cd3647e313c41b2415a374d8e4da8a1c97fb2bf5052cef09
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to domains associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to direct users to malicious content. The PDF structure and numerous external links are indicative of a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ingpiazza.eu/userfiles/files/bivixo.pdf In PDF document text
    • http://fatamorgana.fr/uploads/assets/file/43991288.pdfIn PDF document text
    • http://cy2hand.com/userfiles/tojusamitosokez.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/zagoputotuxovogubile.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f603cc62c8e---12224155713.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/gajasota.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe7ac9c374---14002943708.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160818ec28f969---tapomafabenokabubi.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/t9esth1dr093d320s10044st56/sapopeviritakekuw.pdfIn PDF document text
    • http://allasclub.com/campannas/file/88325845615.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5f9bd9af3---10748165001.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/32722821418.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/kubebimapobag.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021050202294151.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c39ca527d---rabuveridasiki.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160908669d7b8b---xodaginevijenitig.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/pevekifotisadogabakosanuw.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/161c6edc447f207f1a8a2bd9b826f1fc/newufimuziwi.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/80936230687.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/ponujewakezijowavugod.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/nedinelufojawa.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c90e3313d4---6390510321.pdfIn PDF document text
    • http://fgosvo.ru/files/files/fubim.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/f89a0045d1bbbae85902f9527d8b2581/gibigigupimolalimafosigu.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/xubesaxes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ventajas+y+desventajas+de+usar+redes+inalambricasPDF 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_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 17368 bytes
SHA-256: 0b0fa5c569594a4cb0fc7943db56db3608687ddc3d09c8fcb360abf5987f2075
font_01_sfnt_off00012076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001388d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388D 10928 bytes
SHA-256: 612f51cfa2af750bf68fd4475ba634158c425a1491f0a49916e6d155d5dddc9f

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