Malicious PDF — malware analysis report

Static analysis result for SHA-256 59e48d9a674a74d2…

MALICIOUS

PDF

86.7 KB Created: 2021-09-13 04:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ece99de8d212092cb5a601f122674a09 SHA-1: 0d6b816b14fa0687a43df310b1bc78d2b11ca5bb SHA-256: 59e48d9a674a74d260de7989c021161a7e9f7740e780b21a56e85527a2230c15
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload storage and disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://china-hold.com/UploadFile/file/20210903072311684.pdf In PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/wopelevopiwovazizusuj.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/26135018901.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/qc5094qmuqj2i3ljbobtjqke83/42195909673.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/pitenawoj.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16310735945487.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/6033185269.pdfIn PDF document text
    • http://pasaru.com/upload/files/zojijorefar.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/dijezigawumo.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021090519131_612924947.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/31954551979.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cff6d7d28f---zodijovapitunarenefe.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8ae0c8884---fazopapar.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/zivivesez.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/dewikoxofikidelujajif.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/11801149173.pdfIn PDF document text
    • https://premium-house.uz/images/file/ziwimefeni.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/46389224090.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/raxasunobalol.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/guvobepidadanebapepo.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/nupusasokametafazufe.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/bazumeduledavuninag.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/zuduvibowemapaka.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210908035747.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/d6a2a26f6c3b00a92ae5598dc6146cb4/91190065075.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/3987142859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=effective+teaching+strategies+that+accommodate+diverse+learners+pdfPDF link annotation
    • 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_off0000edae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 17364 bytes
SHA-256: 68c228c200c39a5bf2126505e64d62fddae9aa2fa778f62c79e6e2ee21a46022
font_01_sfnt_off00011ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F5 11116 bytes
SHA-256: 67fc67260053949a9b04b444ff18cc5e11e0ffa5b064b4a6520c1e0790e80aa6

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