Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c1f3fadc59febd…

MALICIOUS

PDF

90.3 KB Created: 2021-09-04 07:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 461c0d7a47f9479a123be886d2ce003e SHA-1: 76550104117e30e19af9d6f568513245be480850 SHA-256: 90c1f3fadc59febd3d0cf82b15d67525661c9fd4ced6329b552386b82cc10967
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs and link farm patterns, indicating an attempt to redirect users to potentially harmful websites. The presence of compromised CMS upload links further suggests a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=lactancia+materna+pdf+oms+2018 PDF link annotation
    • http://muacuoi.vn/Pictures/files/83830994777.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/fejaliburixowafomuke.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/pibujigimixi.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/45010709053.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/3osea7juhckih4dtrl4sqmse6o/pofosidobuv.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094601b60d64---satolilu.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/towumapufugaxowexuwa.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/kulumowoxafikodunenobeza.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/74273447371.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607163bb0154c---refaxema.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/ac7f0ff6c01179dcf21a2e65bde98207/kifefurulobevosu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b063f34d981---wenumaxele.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/78244100316.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d33ddabe5---zoragirasi.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/lotanizidopimew.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/tulubipodawavirelipejol.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ad69b7dd9---60380115892.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/8370901180.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/vedadovu.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/6ddtll51mdc00cr9h37hbbfsb7/zijodewufurelogume.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/24248794597.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2d6c2c5e8---widubexinejujovuwinikam.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734a3f9d907---nagarofejikuwudikene.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105011856451065.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 19560 bytes
SHA-256: d5e70e04dfb8f054b46d0fbad6bb84795a32c421888097f5b962b6410797df28
font_01_sfnt_off0001292b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292B 11196 bytes
SHA-256: 381dbc0e0d39f2b79fa19384ddd62dd6827c896d19d3824cbadfe89806c5e0ec
font_02_sfnt_off00014370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14370 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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