Malicious PDF — malware analysis report

Static analysis result for SHA-256 de23f0fea2d29ff9…

MALICIOUS

PDF

85.6 KB Created: 2021-09-23 00:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 198123bf28e6fcc37ddcf0026dd7dc34 SHA-1: 0453b5a2000fe8dc2350f992d1ffb36d1b28470f SHA-256: de23f0fea2d29ff96c1c5da2755b46c65a468423f5828b9abb6e8c1237f6f50d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack by embedding these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://laborke.ru/uplcv?utm_term=a+list+of+social+problems PDF link annotation
    • http://ilovechardonnayhills.com/userimages/60458692609.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/80085764115.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/49649319015.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/1273715106.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/67622351441.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134e23aae47c---902673037.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/14379194385.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161454fccd4a8e---20054653396.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210905181705.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/d85e32d3dafe80f8239f57e1bce0f5e5/tumavixixusesizut.pdfIn PDF document text
    • http://darstin.com/userfiles/files/85197125928.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/birovasuxevulazu.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161300bbb58326---bokixanix.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/38333033539.pdfIn PDF document text
    • http://philboyd.com/dulebe.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/dofinibesomarereb.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/tisukaviwazagewigezogas.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/sazexur.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/78453695253.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/88120478780.pdfIn PDF document text
    • https://thietbigas.net/media/files/34734804190.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/48626274439.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/90405352937.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/belora.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_off0000ea2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10246 10660 bytes
SHA-256: b2925f9f19053dc7263623d3f3715dbe2a066975e147e0162e57891ba2577f5d
font_02_sfnt_off00011a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8A 17884 bytes
SHA-256: 15d75ae343acb7126d68a6922d6eea7b4c0763d13ea950b0847375a80266419c

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