Malicious PDF — malware analysis report

Static analysis result for SHA-256 405554c326d83d40…

MALICIOUS

PDF

78.3 KB Created: 2021-09-21 03:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0735229a9e85b3c695b86383bfee57f1 SHA-1: 21287c0c3b4d0dac77c6d81495e53f9f71b5551e SHA-256: 405554c326d83d40c85a7c1872efc00fa5507ec24a7d3fda3461cb247f75a3dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs, even if some are marked benign, reinforces the intent to direct users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://riviera.az/userfiles/file/rumagiz.pdf In PDF document text
    • http://3sdent.com/upload/files/lizulisub.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/wevizibasugi.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/nokekavumibaboxemijozutit.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/40561795142.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/96091838673.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff95e6eacb---sefemukidejitozum.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb4aea4e23---tefolimude.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/25388298241.pdfIn PDF document text
    • https://webmenuplus.com/images/file/rasasuruvogetesokawulos.pdfIn PDF document text
    • https://777mto.info/contents/files/50253432557.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/71475387706.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471144679d9---12298958059.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/57114440303.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/wurovubud.pdfIn PDF document text
    • https://kinhdoanhvaphapluat.com/img-dn/files/45384927047.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/nuresakilavunenel.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16147dc2d85abe---65019786944.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/duzitekigebifuxusida.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136c7b2c9868---54141900768.pdfIn PDF document text
    • https://pontus-sd.eu/uploads/file/sisizorolufaxorev.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/49908045241.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/mamazal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=download+drastic+ds+emulator+apk+full+version+englishPDF 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_off0000ca10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE222 17752 bytes
SHA-256: bf4a0e35a57d5498821247bfa84ed35ffb7ec10882f5cf0f01231855d34196f4
font_02_sfnt_off0001104c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104C 11412 bytes
SHA-256: 8f75638968d04b2786b247981c28d430c6b21b04b63c6b0bcd19a55c34afa0a5

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