Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38b8dfe02edd28d…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 17:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 7efb6c9a25db6c1f113ddc42b4946f1d SHA-1: 18e5dce0266a76ba8e4e4e079f3ce40317510ed2 SHA-256: c38b8dfe02edd28de31e65d29cdf37ca7778067c6a5b2186f242c6681747025b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress installations and other domains. These links likely serve to distribute further malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776de7b7a67---burujutibakuparip.pdf In PDF document text
    • https://golf-tout-terrain.com/publish/page/file/gilukuxej.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608611416b540---18120227274.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16086d87152dc6---ruxafixuxevufon.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/jovemesegerebil.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/valakiwitobogoregedo.pdfIn PDF document text
    • http://mytaylormadefamilyusa.com/clients/864113/File/51210601437.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/9c3872f0eae1ca071bf48729de9168d5/bimigev.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/61054618066.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a6cdb43d0---zanokukapiranubadowabati.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/gufuruserenosor.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/83ktlq9magunntcstu0iiqbctd/xurusi.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/16767045815.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/tibukogipoxoxagajupopor.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/5m2pg6n7fuk1ndq08fisgb12p7/56249559356.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/wupasagogevepura.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/ruvutabofuxane.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/41101262876.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/1073cd948a4d89f9f5236f03514c5d1b/47125141719.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/34696712033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=atmega328p+pinout+sticker+pdfPDF 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_off0000d307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD307 11592 bytes
SHA-256: 3366cb3d5c03f282938e80014d67eeaf8e6187c3da5af6cb230ae82eeca5ddfb
font_01_sfnt_off0000ee7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001068e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068E 17040 bytes
SHA-256: b044b15495e9f705950dc13e6d90db0e1db8f23f4391800a60751d707c796963