Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33eaee5af3e2add…

MALICIOUS

PDF

75.6 KB Created: 2021-09-07 19:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b5c143aefc50558db0529abea37f05f5 SHA-1: 92d1577aca2ae8fd98c84984bae02bc86ef021a7 SHA-256: f33eaee5af3e2addacc6b710ab96cbb575e94666e05ce9da02fe29dbc33c7d66
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised websites and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/224423d2549d9ba879f2f6bb9946b1ea/91977606041.pdf In PDF document text
    • http://mt-filtration.com/uploaded/file/146437531160cf589f7b9d0.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16079b102cb97e---41790764687.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abca683f6b5---xapenopodabanorawas.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/rajudefinuvo.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/30216374489.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/61684597728.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210708064642.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/67287519540.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/9473430184.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/fuwexidagabujawisuvomazi.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4608edd46---degopuzosumofobek.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/90060975051.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/nilexun.pdfIn PDF document text
    • http://chikatere.com/Upload/files/disodadulodi.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/folavageguxinakeladifaxas.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210704021204.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/1042935732.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/adf0417b844f03a5c5b78d754e7ce1a5/56843103410.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac651ce890c---89343398828.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/womelafugavulavuli.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161154604ab34e---960238639.pdfIn PDF document text
    • http://learningkey.org/userfiles/26354154244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=identifying+triangles+worksheet+ks2PDF 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_off0000c48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA2 10996 bytes
SHA-256: f86101e7ef854a3b16a569ada7e536deae0b74aaef0cf2ada7bcd5c98600f254
font_02_sfnt_off0000f606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF606 16908 bytes
SHA-256: 69a67e216ae57d0642f7d24897ac51e59e3c575fd98a8e1755ac431294ad1368

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