Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dbdb7f4bbb87420…

MALICIOUS

PDF

86.1 KB Created: 2021-09-05 09:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3521c3e74ee08bdcc91a33ce65d9358e SHA-1: b3c3f68adcbaeb07f7580ea21a77aa747915c1cc SHA-256: 1dbdb7f4bbb87420e3da30180b64816cb1f0777dec842a53b0e5501643d79a52
156 Risk Score

Malware Insights

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

The file was identified 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 various websites, including those hosted on compromised CMS platforms. This suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://haohanlegend.com/Uploadfiles/files/gofuguxivisuwuvu.pdf In PDF document text
    • http://onelove.cz/file/2590940530.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/nozos.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/14330145106.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/warusujerow.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b6153b1d79c---39003613633.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fa60b7cc7---72690787121.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/do8fgd3mij34kkcs2ebbhiq5m4/vudisefabetodol.pdfIn PDF document text
    • http://hilltoplancers1975.com/clients/13753/File/52749643585.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848028c0a80---wamedaweg.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/83726510993.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b431234b46f---44189695394.pdfIn PDF document text
    • http://sam-global.info/files/file/39113361907.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074b4417f3e0---pejukanetiroravugaf.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/4581331514.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/fifofe.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/poximikuzadibojenomes.pdfIn PDF document text
    • http://bichvan.vn/upload/files/nozitafukezepuxuzejokare.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/kezamejarewojiwakutiwu.pdfIn PDF document text
    • https://fallsplat.se/file/lamunovitazimi.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/zibapimojogajokowetif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=pdf+of+sum+of+iid+random+variablesPDF 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_off0000e41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41F 10724 bytes
SHA-256: 2204ae3dcc1e77c3b23322aca89bd7bc3449df9b9586648d5a6da33839d5f729
font_01_sfnt_off0000fcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB9 20432 bytes
SHA-256: db21d28a3466a81ccf7ab806a76804b46f6ffd652d9e13e377ccfe9ca0029280
font_02_sfnt_off000132bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1