Malicious PDF — malware analysis report

Static analysis result for SHA-256 24bf5cb3b934bbfc…

MALICIOUS

PDF

86.3 KB Created: 2021-07-06 11:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4a190951af06bb1dace3c861b8dd3fad SHA-1: f6b3584ad9dd39eb27d5e1ad74898745b5c3cadc SHA-256: 24bf5cb3b934bbfcac850c5e2b919e19834372652cec1b4bf1d0c7365861d86b
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised CMS upload locations and disposable hosting sites. The primary purpose appears to be to exploit users by directing them to malicious URLs, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://philabc.ru/uplcv?utm_term=definition+of+criticism+in+literature PDF link annotation
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/l2pa2ofd747hm5q7rkae40o896/40177097967.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/51507880074.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ac161701f8c486bf3bf43ad380d7924b/36924272825.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae68b8cd5b1---fetikugenijigajaf.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c108b456d18---67830194069.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/c51b5b36d7ace547a22eb552a7d6a1e6/kimir.pdfIn PDF document text
    • http://charivne.info/images/file/safomojejilesa.pdfIn PDF document text
    • http://wawa757.com/uploads/files/lerixomomajafijagumoziri.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/xupug.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f8bc3e869---77809578828.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb711268746---30121542221.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/zopemoberogodolosuzef.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7ee5ed7ec---bilokiruwilelujer.pdfIn PDF document text
    • http://rajeshjshahani.com/clients/d/de/defaee86e9f1fedea086b53a5072ac2c/File/73843311414.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/h7sjah4sss649b6ugvsgalqq73/piwukomalotegoxupedon.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/bkn166t7pta8qduvddekqlt5it/pakapidedud.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e43c7dbf8---roduwabeziz.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ddda8e70a9d---wenugimabut.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9a2c7fcea---towidokabaridekagojebuzes.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/97199940552.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/mewon.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/wemajogunap.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d99f918ea---benuje.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_off0000ed59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 17608 bytes
SHA-256: 406209b69b89069fd6409a2ffa922541921c78b93504046d4a1752b711a125ec
font_01_sfnt_off00011b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B74 10600 bytes
SHA-256: 17f9b78199a30424c226d415e64f0f8eab3c19d8bbb95402e38821226e0e8a87
font_02_sfnt_off000133ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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