Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3da7c80098a89be…

MALICIOUS

PDF

81.6 KB Created: 2021-09-02 19:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 39a986a77ee2949680c33ff415285e91 SHA-1: 3178198ef6d1daa9dee028c362e0f38625ee3d9c SHA-256: d3da7c80098a89bebd51dc41f4c2ebc92ed9bb10aa808b5580fa0053554dabc4
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or redirection scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose but reinforcing the idea of a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b614460ff3---jikod.pdf In PDF document text
    • http://jumpinfit.it/userfiles/files/36525006465.pdfIn PDF document text
    • http://tillyardci.com/userfiles/file/17367007857.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/rufuvezuterulus.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d83001439eb---mefurozub.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/mekivafufoxixenik.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/8336bfd50691941dc9c8f64c577b5033/77509967812.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfb7b75754---jazosumud.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/tetozorazixul.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/nowelupi.pdfIn PDF document text
    • http://koala-al.com/d/files/46874431180.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/32485044837.pdfIn PDF document text
    • https://groupunsur3.com/contents//files/xojikuzef.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/biwidumunilu.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/8l61qqiqm2p0j8m97a0tj63koh/najasejeroli.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/45878fe30200ce2d9fc9a4cae4d20305/48895492335.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868017ccb3c---17520689244.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/96609112388.pdfIn PDF document text
    • http://regcureguide.com/files/files/19832295295.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a97746dc4---4692783227.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/gezejaze.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/j005b0aessgapos33agh6vg9e4/68926514779.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed898ca11c---45180916808.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/pajozizo.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07be451ec1---senubadejododatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=hanuman+chalisa+in+odia+pdf+filePDF 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_off0000d114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE926 21268 bytes
SHA-256: f17d2a21fd5cee94ed57716a4d0a1a6742d50d293e74e5d267583323d9daf463
font_02_sfnt_off0001200a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200A 10776 bytes
SHA-256: 242965e27fcc8ef0251ce7ee8677496be681c61526ef88e08791480225269888

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