Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e168ff665524865…

MALICIOUS

PDF

89.0 KB Created: 2021-07-09 17:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4aec3ec466dcf4917ec14c53fcfdb462 SHA-1: ab3b4b1776d875c3d90b06af954ae6ad5c63ea77 SHA-256: 5e168ff665524865ad738342b3af601ab48f74475afa211598492d7c0a6cdda1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://progin.ch/ckfinder/userfiles/files/sagaridega.pdf In PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d0fed56e9---pefomir.pdfIn PDF document text
    • https://maviet.vn/upload/files/geduxibese.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/b605f944848264cbb1f6a7d82704f0b2/libebupa.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/dekawizulufevenavemaro.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/pilepebofuvajobex.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/5ulpdtgd2bo5fgcp9e23k9lv94/wezimujulipasovabejatu.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc04ddaf3e---73739277970.pdfIn PDF document text
    • http://chhsclassof64.com/clients/b/b2/b21d6454c74b38f294a67049e63db9d7/File/jamapeduli.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e4523b7a1---560570037.pdfIn PDF document text
    • https://triosms.com/userfiles/file/21645217903.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/h46uaf71krhpk1qi5l7ggmavii/tejugenivavuruj.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099fe618f018---rujoredotirejalagafasopi.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160736b2b400dd---xaxamogotugasopoginejaw.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/fitutifazigelinorakokel.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/fosilunodes.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/sososigenerin.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a015cba28e5---lidijexejusiwizawoborazi.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/malalaxowedal.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/4bf4dec16420df15282aef2f752a991d/bujetipozusezu.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/nafelemasazixedev.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/1710957732.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/fvc5qk512qnhov2bnvdkg1igcl/sexixiduguwijurex.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/jajugujetekimu.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/8i30lrasc44h89u5iufdfcr5fc/30515527264.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/b35b84b4e0238967f75620800ad757fb/dafezafozalepiduwetibid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=homemade+insecticide+sprayPDF 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_off0000f94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94E 17016 bytes
SHA-256: 064ebd4b71c1d5dbfa132b9173d51a6d1313133fca08cac679e306798a346ed9
font_01_sfnt_off000125b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B4 10736 bytes
SHA-256: 229cdd3038c86d9b4f9ed8d34e5e344dd5dde913b3c849de0874e3251afc96cd
font_02_sfnt_off00013e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1