Malicious PDF — malware analysis report

Static analysis result for SHA-256 f971efb73931b657…

MALICIOUS

PDF

92.5 KB Created: 2021-09-21 05:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4eb72fb528f2ca39fcc3244bf0973168 SHA-1: 4eacf7268f3cb302da1b52854e673a4d31781cf8 SHA-256: f971efb73931b657772374588d6705afb65cf239500a686e0d16340dd4e38731
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing numerous embedded URLs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' highlights links to compromised WordPress upload storage. This suggests the PDF is designed to lure users to malicious sites, likely for phishing or to download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://oniceh.ru/uplcv?utm_term=run+android+emulator+from+command+line PDF link annotation
    • http://xz-brand.com/ckfinder/userfiles/files/kowabibiragiwepizazega.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/15785148507.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/83148855301.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/puserawo.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/padimivetudiwegojovuf.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/99609493632.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331f5533374---95233213799.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/12433474111.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/powiteruzizazawis.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/motunonirinidu.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/45092703092.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/90l4tnmiv94c0subt6arv0i657/87381468489.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/4e58a1e6721d3d35a4ea6b4bedfb1202/88832416188.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/49690193415.pdfIn PDF document text
    • http://wamer.org/userfiles/file/xiwofogenujodav.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/paxasarod.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/zejijunozan.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131041842e1b---30240978594.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/mexubanapemev.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/sekirigipaferokilogima.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/89583591228.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/57982358438.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/95760373809.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_off00010500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10500 10616 bytes
SHA-256: f0027c60f7acac75a3fdd95f65b8e1bf57bce306225cd3e95d1959cabe3df495
font_01_sfnt_off00011d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D39 17848 bytes
SHA-256: 98935d4a271ea9d9ac5a0cfb11a094a6fb2de0025aab3022c64f46b1859b7241
font_02_sfnt_off00014bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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