Malicious PDF — malware analysis report

Static analysis result for SHA-256 50fb346e46ea2c0a…

MALICIOUS

PDF

89.8 KB Created: 2021-07-16 07:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ef7687b5b2e46acbe4e7d4ebb5099a2e SHA-1: dffcfb405ef73a429f41da53312588be59d91bf0 SHA-256: 50fb346e46ea2c0a1346602b51a976b37ba6197ac9a5579fde7d5a15b04a13ca
116 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs, many of which point to external websites. One heuristic specifically flagged a URI pointing to a raw IP address, indicating a potential attempt to bypass domain reputation checks. The ML classifier also strongly indicated maliciousness. The document's structure suggests it's designed to lead users to a variety of potentially compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.chatanakonci.cz/userfiles/file/12887334700.pdf In PDF document text
    • http://childconnect.com/swi/fckfiles//file/72575297745.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/0ef0f903befdf34ee3f12ab8a132227a/26965201524.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/71234214391.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/orslu4jegf7vn252deai57ef22/xotutevubojis.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c99e100d5---zuvusovunamuwuzasik.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79aefee6f7---zimabosagapigelun.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/pisojatoborixowolilubeko.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/mowibekal.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/dojagevob.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915e5c3f3c0---6389974830.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/jitegawijomev.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160d646059f3cc---semuxalumokufosefudiku.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/74513448676.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5111b9633---pafibovodasawipo.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/34371588466.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/zudiwobapaxubojemu.pdfPDF link annotation
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/jubodipulerojajuzoxekogex.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/55010490a26e45d8b8f9fc858590ea86/15643053520.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d894a81a08---44375781617.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/77490254345.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/pb13fbi2jn5cbb119p7ic6pc5t/30620389606.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8c09f0a68---soriselujefutifefadew.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/morutofonedavereg.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/tefasavaxesu.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/8b2a5381438d0a627bff5a61c82e6c81/bupediwixebuximavuzen.pdfIn PDF document text
    • http://sunnysideclassof64.com/clients/a/ac/acc4ccb49d7935ca36198347b895393e/File/pilifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+economics+of+money+banking+and+financial+markets+11th+edition+solution+manual+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_off0000f902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF902 11528 bytes
SHA-256: 7b38b2e5255869a9c8ad48dbd0aac958083f8252e195e2aa8cbd3b629fd61d18
font_01_sfnt_off000113d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE4 17248 bytes
SHA-256: bae199ee2f1719c5d85c34005769311a8644c8fed1cec51b2a2f1095c7d790f2

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