Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f00a9dd04a6aa30…

MALICIOUS

PDF

86.0 KB Created: 2021-09-05 03:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d3d43e20abc4c3e8f2659555087ff98e SHA-1: 5aa218d7fec263bd851eaa6da514193e77914cab SHA-256: 5f00a9dd04a6aa30226ea8e5f5ff402b3c02c5a44f45a175a7195c04b445f9c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the detection results strongly indicate a phishing or malware distribution attempt.

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://pistant.ru/uplcv?utm_term=eachine+e520s+manual+pdf PDF link annotation
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b98a6f9f8eb---defik.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/44944493727.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210520204451125.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/28176232603.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/filejeroripurar.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/wasopu.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/f1ba59d97ca7c0e0e4a4ec510c0b0d8c/51307143973.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/5olq1djlvhqgc70no9mji9qt01/99332527940.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/davizebezojanefar.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021052516173919.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a37517e0f5---11409849400.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/zitedatuvukiliwi.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/letimasijexikarunubanages.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d045d5721---rabiwakarujixu.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/b9012c2049c6fb3177d77c7a3fdd7846/ganirotisulobikidan.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/66789531016.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/poxosexexom.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/3455636744.pdfIn PDF document text
    • http://landpas.pl/upload/file/givejevulififeri.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/45108392568.pdfIn PDF document text
    • http://anpo.vn/upload/files/komukorurafe.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/39874992.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/81109274211.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_off0000e517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE517 19428 bytes
SHA-256: 465c6be92ec69b9e991490e84f8730a0545f5fe5dbc1fbecdfcf0e0357b1f624
font_01_sfnt_off00011783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11783 11024 bytes
SHA-256: b7db8e6dddd7a502e953d513bd1abfa7394a70c159021f7f1ea56d5b6c4cacbf
font_02_sfnt_off000130fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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