Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1df5cf3c79763d1…

MALICIOUS

PDF

88.7 KB Created: 2021-09-05 00:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d7cb94322bb328a212524f689b22a7e1 SHA-1: 272964d53ef7048c3ed593b3e818f85fe1b78657 SHA-256: f1df5cf3c79763d17a2d050a93f84acf34cbd5b2b35c2ed8ce723657ef505469
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the PDF is designed to redirect users to malicious content, likely for credential harvesting or to initiate further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://krisoc.ru/uplcv?utm_term=numerical+aperture+of+optical+fibre+experiment+pdf PDF link annotation
    • http://captaincook.hu/userfiles/file/rafuzofodovonezokal.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161320be2c57e2---79086005573.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429043915885575.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609047d3230a1---10986916458.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/viratugazisejakinabez.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/b83cf6453c3ec63e97526ffc796ddd50/50601451428.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/mumulasaf.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160e67868a0a71---nexilemi.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/basimedirexilinuredemozu.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/23365813499.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/rokavuguxob.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/60559484437.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/f8eb69cb39a88fd88e7d214c5cc2fbee/raxalopa.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/5210c8eaf20d946f7a426c008c7af24c/58777094055.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/sisanodef.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/34412676838.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/83853677760.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/neghr95emrivjf3s7grqr1qbjo/96388016727.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/c632e0b40f95ef730d119b2e05b88c77/pubavanafabewuxisozerege.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e127966378---23601561532.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/fetugifupabawuga.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/38075612389.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/98550c905731dc7055902b80b5d7e494/bigijag.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_off0000ef5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10776 10932 bytes
SHA-256: fe0bc9965a6881b3628485248469c0d787fed94b741f707525c9c0f8a0dc8cf7
font_02_sfnt_off00012085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12085 19908 bytes
SHA-256: 42482b710979442357f83b02f3d3209e55160991df7b6cdc89f3501f8d42231b

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