Malicious PDF — malware analysis report

Static analysis result for SHA-256 eccb76d67d8d6ba9…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 05:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ccc90d5746c7a0ec920a1133a02afeda SHA-1: 74c83e41727631178342da4dd054d885e926bd27 SHA-256: eccb76d67d8d6ba9d90f0e9d2a7136103712c708be8f8f7373b46b1a858e9c4c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are flagged as link farms on disposable or potentially compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised CMS upload directories further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wecans.net/_UploadFile/Images/file/87380701237.pdf In PDF document text
    • https://santehsevast.ru/userfiles/files/41702336284.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/bikadimewagesokobufetit.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/buvonibefikud.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608841fba9481---42944585989.pdfIn PDF document text
    • https://nasikampung.info/contents//files/9156497373.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/tegakosiveta.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/dumikurukiges.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/90630956456.pdfIn PDF document text
    • http://iwishop.hu/file/4571348236.pdfIn PDF document text
    • http://kaies.cn/upfiles/210602101835348229lgog4y.pdfIn PDF document text
    • http://robinsonsmithreunion.com/clients/879094/File/85842987754.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/24999284417.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210808152125132.pdfIn PDF document text
    • https://plasy.com/uploads/file/fufalenujeduse.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/duzerumifezareju.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/veputaxarojabav.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/fevuwoxuw.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/80162002167.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/taverelawuxa.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba447520d59---wuzemok.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/7a7cfe4e5e2a7714162a383cfdcae9ed/29630198171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pathfinder+feats+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_off0000dedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EE 16996 bytes
SHA-256: e97d1060a4031e7817f81836dadad0e1285d787466b6d37676c8086ff074c3ad
font_02_sfnt_off00012352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12352 10432 bytes
SHA-256: bb9fc4b4029b8d5b5e9aa33336e3cc76990abcd9ffd4acad07ee265582e51117