Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f476dbd97bc29e…

MALICIOUS

PDF

100.8 KB Created: 2021-09-04 01:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d8bfe77a7f4875a337bf09a057ea7a38 SHA-1: 03da5ae431829a989f005d26f2c34b91a2270b65 SHA-256: e3f476dbd97bc29e10431b00081d62ecff3709f8fe1acbc23fdeb889533b1378
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are often used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=the+generic+strategy+trap+miller+1992+pdf PDF link annotation
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad506bbce2f---71893972491.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132a1fcb529f---42243034989.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/takojulobukagesote.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/vegiwewagizarubeb.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/55437444328.pdfIn PDF document text
    • http://retailcop.ca/files/27164423110.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/14814072209.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68923366319.pdfIn PDF document text
    • http://vtaky.sk/media/file/vopudenexejof.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/budibikedijeveve.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/kexotopamemobafo.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1db6a073d---38882836828.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fd3e8e2eb---77368949939.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/70722247195.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c674b8e9b9---10539844897.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16096cb94a58ce---batisobukifavuzafevowoz.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/gobixarijufim.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/45100229722.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210812230026.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/77742354347.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/kifokevofufaj.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/sokokagatufo.pdfIn PDF document text
    • https://atiksigorta.com/files/97568266184.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_off00011f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13791 19588 bytes
SHA-256: 0352ba699e5650815b69b5ab92ce4b418201ae53a73aabcbe4ef6b4aa65bd1af
font_02_sfnt_off00016b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B13 11364 bytes
SHA-256: 55cd004f057810e72e34333a28d5642e389e63a1bb5001e94fea4a808a159f2b

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