Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ae4d09821f0cc7…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 22:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 872ae0bab0d2dc0e1dc076d237376ca4 SHA-1: 9cce886ebdeb99bbee3f47991c217a49c9c7b348 SHA-256: c9ae4d09821f0cc7f90fb7e13322427f37f249711dfd0984e371440513e04b9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to other PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are on disposable hosting and use UTM parameters, common in phishing campaigns. No scripts were extracted, but the structure strongly implies a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://drafthe.ru/uplcv?utm_term=123+movie+apk PDF link annotation
    • https://groupburuemas1.com/contents/files/18668684362.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/vivibax.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/22709538289.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/xozovaleferarikafozare.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613267da8b1f1---jazoxowonukiwupodi.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/ci097dit44f681lgdjtf3lqupr/wenipetipawela.pdfIn PDF document text
    • http://mq-water.net/upload/tefevikawebozuv.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/94045626921.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/simakalifebites.pdfIn PDF document text
    • https://badrivishal.com/media/birozukab.pdfIn PDF document text
    • https://robodom.si/files_vsebine/89621119977.pdfIn PDF document text
    • http://exim5.hu/_user/file/delobid.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/76000744122.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/luwobiwukudesedikexaseri.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/38067383415.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/mesasamuzasulumemawovem.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/93936388818.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/dimokejabukatumaxa.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/pelilumasiled.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/tomativaxobufuxuzuxekum.pdfIn PDF document text
    • https://equinox-e.com/upload/files/sufiporefin.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613846431b01c---fopujorerosoxowajanami.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/625385315.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a555c3bf3---goxofota.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/46077391003.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/xigoseteni.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_off0000dbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FE 18000 bytes
SHA-256: adf418d5d6498ee22b46aa86c9ff19dc34c2e9cb5b75868a9bf27aaa60307586
font_02_sfnt_off000122b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B4 10300 bytes
SHA-256: b07e678165d535f2a2dec742d07a2e9cadd8443b82c43f3373dee5e16d2135fe

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