Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb3d07ad50ca9f2…

MALICIOUS

PDF

82.5 KB Created: 2021-09-22 15:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 838f9f7eb6e8a504e5ae25bd1bf1027f SHA-1: a704b9e7402f69e985f5dcee7aee4c9ed018c7f0 SHA-256: 6bb3d07ad50ca9f2e0bbaf251b80b29b2255d4fd629acb2058367a1a267b120b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with spearphishing attachments used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://cn-daomeng.com/upload/userfiles/files/f644e4dd84e8253cdd7d4b740c8b80f2.pdf In PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/205c8ef56efd4a6c52b78ae669176f4c/9617307985.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/dadoxomavolu.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/favawelevifelutew.pdfIn PDF document text
    • https://trexanh.net/upload/files/2665414322.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613944e1755d4---14644084123.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/vipebago.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/23914249203.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/jegomedazebawajotogaba.pdfIn PDF document text
    • http://perksys.com/userfiles/file/gikexekobipexijimojol.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b809156ab---waxuwigelazozowiwuf.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/16747031010.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/32904671577.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/takutefobuxuf.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161305a18a818b---vilasekofuzip.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/87958262640.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/lifupogopigilozadojureve.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/21619856338.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614913f4295bc---sozepugiwiwipudokofeziv.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/85799136250.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/koveniliwidamizi.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/7d24d9254aca9256d943e63d289dcbaf/10236777435.pdfIn PDF document text
    • http://synphabase.ch/upload/file/wajut.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/diveboratebonekujo.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/moxesijijukajogam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=latest+version+of+minecraft+androidPDF 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_off0000df4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4A 17692 bytes
SHA-256: 267f6969ceda960981443ea27028ff022377641367614560e390add91ea01ae1
font_01_sfnt_off00010c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C49 10616 bytes
SHA-256: 6406ee3ebf1067c781e49d7141b232ef332bd3773fb884b36a8100917acda02e
font_02_sfnt_off00012499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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