Malicious PDF — malware analysis report

Static analysis result for SHA-256 5109a96de31bfdd9…

MALICIOUS

PDF

85.2 KB Created: 2021-09-03 07:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e5d464a73b45d85c88a8f5cbc070c881 SHA-1: 9a2a96d672d806c374386d706375b73854ecbc2a SHA-256: 5109a96de31bfdd99bf795af075c2648aae64852a666668e910f0cb572eaf1a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external resources, many hosted on compromised websites, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious content or download further payloads.

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://huntic.ru/uplcv?utm_term=technical+support+executive+resume+pdf PDF link annotation
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/577cb277d76fac8677064ae017170d0d/zegokazinimobemowoxo.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/lonir.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/dejizelenoporab.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/96jivf76re7sfo4i65g85qebt8/5422945440.pdfIn PDF document text
    • https://m3csrl.com/file/xozevolixedeweler.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/agkk79dp6r29dkumvh5chcks25/dexawil.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/31253378925.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d95f7c9c708---vafipudavazuri.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/gavano.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/fuziworanofow.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/lulesukaxodawopira.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/80550992270.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/99b2bf9f2d1689c4a5dc038e5fb40427/50618738179.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/93639088637.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161002ff455ce0---80818501844.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/61323450967.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03628a71e6---23211199776.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/5429072796.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/farak.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c2533cd28---29745277259.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/26239078528.pdfIn PDF document text
    • http://aimic.com/userfiles/file/39873934106.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/8913059700.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_off0000e75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75F 11116 bytes
SHA-256: 70742c0c018a0a17dafa90a0e1e76cf7c3ebc38a9b887587fba603e4e636f0a8
font_01_sfnt_off00010128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10128 17596 bytes
SHA-256: f898fd220e9bd149a520a82b73ffa3811fd744ff3e76361ca3f128c11c1a5e9f
font_02_sfnt_off00012ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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