Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e814af2a23b1ad1…

MALICIOUS

PDF

99.6 KB Created: 2021-07-18 05:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f2ecc92759ad009f68a78352c30d095b SHA-1: eb0aae2da2a895a826c778db20f189a9af4ab76c SHA-256: 0e814af2a23b1ad12d575f321098d0d62953eb649a3c05e81768199be7d9fbfe
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload directories. These links likely serve as a lure for phishing or to distribute further malware, as suggested by the numerous unknown reputation URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160baf4fa49fa3---24252525568.pdf In PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/91e08f07c8d4fa30447eacce531a8c4b/29830360171.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/pabosupumuzedaluredasabum.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/n55vq4hh99mm2vmu82os9ru801/54758217833.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16081a9e15105a---59777682924.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a5344b9c9---gonuforikaxegirunejuruk.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rekusofufixumabo.pdfIn PDF document text
    • http://relatives-united.com/clients/75139/File/dijepibazirejenidebege.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/kevufoxix.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608624d46fc99---vugefaneg.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/26325914896.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/087efab74b2ab972e8a1e491e9e02ad4/42348334667.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/6840e93987e721cca66ea02b8de2de11/98685622910.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/62056258391.pdfIn PDF document text
    • http://waypl.pl/upload/File/71980508412.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776c7a5095e---befuleponura.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c88bec688b6---70303263515.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/zoviv.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c10c5dded1b---11194170213.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/5de620b26b14bbaa3fe773b4ab36879a/73770890887.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fe3398d0b---90526521043.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e70eb7df332---fowawudalase.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/7b149b57e120489d0fa356b24cd9b870/89883442650.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/65036820789.pdfIn PDF document text
    • http://terralindahigh1981.com/clients/866868/File/dawexotigakupoverixowaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=time+charter+and+bareboat+charterPDF 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_off000123ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AB 10524 bytes
SHA-256: 250f86a5e3b1ec5d40bd90738277337fa973e37111984df104c699ef1cc46a3a
font_01_sfnt_off00013b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001537b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1537B 17320 bytes
SHA-256: 26cc902a125f8acf5cd03d4062bae7b1eb552cbadb2cc6ca7af545bab9545b16