Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecee2a938a3b8e60…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 01:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2bca93afb63edda12373923fe231f0ab SHA-1: 3004e39c140421fdc63bb7339717b99eb7da4277 SHA-256: ecee2a938a3b8e6099a7072a059b4f37c3f64926a5593c2558ce6cf399b0df3c
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links pointing to various websites, many of which are hosted on compromised or disposable domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites for distribution. ClamAV detection and the ML classifier further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=ukulele+christmas+songs+tab+pdf PDF link annotation
    • https://qqhanoman.com/contents//files/mowodezutajewa.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/99823817548.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/kojivubo.pdfIn PDF document text
    • https://yuss.it/file/rawutekitusadowinutir.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cc8143a9f---46479752275.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110c0311f3f8---dowapalefabigituxifalizo.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609319dbbe745---14143307246.pdfIn PDF document text
    • https://loctra.net/userfiles/file/wigonatorifowezedifofabov.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/508486476064328db9ded847646bda82/33529349926.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083e00776573---kulinufenolukepegupunik.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba1ad265b1---wuzuwuwixo.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/luvaregudawosa.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2acd89557---77980832573.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/3ee0a515876a88dd83e9202bb3c78296/61653612403.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/xenufe.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/puwinewowuvidez.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087436fd3e7b---2592156294.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce379f2735b---54042991634.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/7qq43fa1lenj1mh55sc9b5914p/rokebovilita.pdfIn PDF document text
    • https://estoniapools.com/contents//files/vamuruvini.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741f13bd138---59182150445.pdfIn PDF document text
    • http://canvangdientu.com/images/file/38091397400.pdfIn PDF document text
    • http://poorclarescork.ie/images/faduxusafubegajupozonet.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/14161620688.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/10045816270.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_off0000e632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE632 11408 bytes
SHA-256: dd1a7664fc79a3a0924c9b7f6ef9c4a08ac36d1991d2e442f4a9e5d577c17e48
font_01_sfnt_off00010081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11893 16560 bytes
SHA-256: 8cdeb028ff4240451c76a84380ee83cd1af116c156d0e5c9525f8f1eae81024c

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