Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4f81519df3ec3f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-02 22:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aece344279a0d41aef31e6bda58d73ab SHA-1: 748830aca8975281737974906fe930a5801f0875 SHA-256: 4d4f81519df3ec3f2234097088a9ec0a8054d3f10041cf3cd75661cfbbdf5322
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains a link farm pointing to numerous compromised websites, including WordPress installations, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs indicates a likely intent to facilitate initial access via spearphishing, leading users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=kumon+math+worksheets+level+h PDF link annotation
    • https://faktxeber.com/resimler/files/52750842142.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a55b6b062---dubevejoweda.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161136547372f3---jerosimemoregedirisifabat.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/97437825396.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac521a0405---xumesunupaxo.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/25338703003.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///baxidifakifuburube.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/bc1d8d87fe0e770b6c183cb6aa6fd303/napoperajodavorilominixo.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/8369321599.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/6kpmivtsugd6m2sv85e3qgssqu/jivinewonose.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aab3d9d131f---lasejiwifetozo.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/44193431306.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbeeba166a---zekinoradone.pdfIn PDF document text
    • http://foxadv.net/file/18876078842.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/82817117845.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/393c05e8c01e6d7b738b4065956a7a8e/60670417547.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/59526240798.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/sezavozisabopuzuf.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/4776078630.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/relubifamowitiruxegemov.pdfIn PDF document text
    • http://anpo.vn/upload/files/58668307984.pdfIn PDF document text
    • http://www.celso.org/download/43600058638.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b21733025da---pitafeloresevibipinom.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/54907643200.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c10f27d811e---12726097217.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_off0000e187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE187 10616 bytes
SHA-256: 72102947d4ecc84dea31a5c2dab6663538f9635faaa06232e42292017ea6162f
font_01_sfnt_off0000f9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AE 16348 bytes
SHA-256: 33f77f56a95192cd35d29ac191daf28e230b53c9cf941002fc4d349e95a2ab8a
font_02_sfnt_off000123bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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