Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0a96d1e3ea48709…

MALICIOUS

PDF

76.3 KB Created: 2021-09-21 02:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8cdf3f6c90ad6d5c4cb86957f7e985b2 SHA-1: 18c4b1f960337d36ea0e49e8fbf4adb5bfb241d3 SHA-256: e0a96d1e3ea487099ea7918bd51cc84d38dd7ae421bf4250e495d35dd95a24de
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the embedded URLs and link farm structure are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jdsliquorlocker.com/nbloom/fckuploads/file/30767314278.pdf In PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/46917585287.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/ruxoxafazegitigez.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161415efa266de---53319254245.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/pejaxikotomofevirisel.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/jopagusegonojowuwidibu.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/sukabozowedevesazu.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/19956059027.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/2lrblchllrl1bbqprs4t5ppdgj/jovifokixuxoba.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/jiwujamiminapenedazox.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/63643586931.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/40068341521.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/fotepugujixude.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/20988250225.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/14505229352.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/96541849412.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/tadivug.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/gakolokode.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/tusomeruvikasenijebisuro.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ee053231b---kabozewar.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613d24f0e2c5f---vamazixe.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a618bdcee---9847951460.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/15467415549.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/37106963188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=descargar+naruto+shippuden+mugen+para+androidPDF 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_off0000c4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F4 11016 bytes
SHA-256: d7e0abe9d97c7b1b1de6a30283c44a4920970a49afa92ff96981c87ab356d22f
font_01_sfnt_off0000de34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE34 17408 bytes
SHA-256: 6b4bb86c23816f0dc34e9d8a5648ea942ea1eac2fd73cb8fe783bfe5ef693b82
font_02_sfnt_off00010b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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