Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc584b020b87734…

MALICIOUS

PDF

81.8 KB Created: 2021-09-09 04:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5f06586eeceda309714553b2072ee0b1 SHA-1: af3c107c1e45e20b2b48daae654033d3259dd543 SHA-256: 8fc584b020b8773480247c4d3275b38cc320f4b9266f0c475c098b04e33f7dcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with many embedded URLs pointing to various websites, including one hosted on a compromised WordPress upload directory. The primary purpose appears to be directing users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://insp.biz/img/file/82653106652.pdf In PDF document text
    • http://orzo.cz/uploaded/files/18241398920.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322a6dc526f---rapisadukazixijijonuv.pdfIn PDF document text
    • http://camonetinternational.com/files/file/jariwusixatotisas.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/54500079566.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/sofowusujupujavodubu.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/74422212303.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/81790644819.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/latiwivelorasasokivolir.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/68130120034.pdfIn PDF document text
    • http://teraval.cz/res/file/ragiriwirulugugesesuso.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161367e2bd4856---melowemojidizewivikotupen.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/tobadebufoja.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394dbc08a95---vapokekibuzotudamisumase.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/10398787871.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/nitugifuxuz.pdfIn PDF document text
    • https://cubic.is/userfiles/file/33696515807.pdfIn PDF document text
    • http://glassick.com/userfiles/file/sufefodikowuwuvir.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/noravapog.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/59331364986.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/62301880509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=classic+movies+streamingPDF 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_off0000dbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDE 10672 bytes
SHA-256: dcf80428030106a8d8674e79b978b897356a0374a45aadc707eef8403aee1227
font_01_sfnt_off0000f45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6F 17728 bytes
SHA-256: f9fbcdc28278bdb1659a70a08286f27fa1dd27261c738a6e8db2ada76a5472f0