Malicious PDF — malware analysis report

Static analysis result for SHA-256 c738bae81eb01b39…

MALICIOUS

PDF

146.4 KB Created: 2021-07-22 00:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 616f26c37f522684537539891a7b45ab SHA-1: 9fb6376c89034558aebe0ddf4716ade971333247 SHA-256: c738bae81eb01b3920cdd6e41f9324ff221f0a505349db70d8a6695325d5da6d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to WordPress sites that appear to be hosting PDF files, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab16a25c2fb---67358348932.pdf In PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/lowodadi.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/36648585543.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/37547200455.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/96c81e7fc0afff842ee3fbba20fbf83c/detov.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/23654827954.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/74611340996.pdfIn PDF document text
    • http://momsystem.ru/public/file/jusopexixewexajo.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/2284197290.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/5dde353257eccf64309caf80bd523fdc/43118408645.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c33dbb547---71111339713.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/judureri.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/97480215233.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/25f40516b83b1e588cd1e1039a27c228/suzemofupapapuruxowugo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820e6410366---60308344446.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/ikh3d1jclthl39thba7ftfhhup/lufinarano.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/87e5c98acef18462870da252dcb4a112/90603036244.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ed643050b---84942978806.pdfIn PDF document text
    • https://capecoralliving.com/media/file/xanixefex.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091eeb7f1c2e---datakosujisoruzel.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607257a8ea789---93424853801.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1274708ab6---82553292556.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/c5782fed032d7ee9dd82eaa9894c72b0/46377081433.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/zexufejavamusejes.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/fhs02gqrvjgruokltjcikdrji6/pebitijejozajal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sand+and+sandstonePDF 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_off0001de3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE3A 17744 bytes
SHA-256: 311adb27eb923bbf6c548e5b259e142b9d0d39afaa9bdb01ffb9f851207ea12b
font_01_sfnt_off00020d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20D0A 10080 bytes
SHA-256: 54ca8a61d8c8ed36d8542a0384edc9e0e42500d436f3619a859681334c107826
font_02_sfnt_off0002239d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2239D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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