Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2392e87c3be1b5…

MALICIOUS

PDF

103.7 KB Created: 2021-07-27 23:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ad4d1cc6f2a87a9b0c7e753038016723 SHA-1: 83413d15de02bd19c05de0fd7ab10823d9ea12b6 SHA-256: 7a2392e87c3be1b557c3266b0632a6f0978270d8104a31aa26033949a754ff0d
204 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, indicated by heuristics for fake invoices and password-protected archives. It contains numerous links to external PDF files hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0f2ce01e3---kubiwoluzamakifutikowikaw.pdf In PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160833fbc7f0ee---xisuxoj.pdfIn PDF document text
    • https://altbuket.ru/files/4628282706.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/39401451329.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/jslur75rc9opkd59amqud10kq8/baruzipepafudavosa.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/6cd02d605d648eb391686fbfeddbd1a5/nuxewewinipefasese.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac99eb2631---73347534371.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/redusubuxozadexogojex.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/78325857280.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/68848218052.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/zukixafejagulazixonak.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704cacbf1c9---10215322045.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/34886568965.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/5134489560.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/59618ea739c7b175f69ff93e8844431a/lalodevumipopupese.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/riladekovejedexo.pdfIn PDF document text
    • https://edarky.net/data/file/xewukuxatefeketeg.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/nidiwipewarazuli.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/94367618383.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/28887830235.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/xaraxidudipijovijufuda.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609d0bf61a088---20525486313.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb36b92bb6---xijototepeze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=what+to+do+if+your+medical+insurance+claim+is+deniedPDF 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_off00013162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13162 10948 bytes
SHA-256: 6cbad74aee827cceade85d9d8d1842dfa1d6b2c20f38e41029aca41d593dc99c
font_01_sfnt_off00014a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A9F 17572 bytes
SHA-256: 85b84143ca0ca52c6dcd9b32bc9309fbd285f1f45ae28a49b5401a608cd546e9
font_02_sfnt_off000178d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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