Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd95f9909b62431…

MALICIOUS

PDF

85.9 KB Created: 2021-09-10 01:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 20ddcd260ff8bbf642d8c07393e30a63 SHA-1: 32b057e014610677027a73123d022b9191911fe9 SHA-256: dcd95f9909b62431e5fd76e263234f542a85e04194137713976ad06f623a1c2a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. The primary goal appears to be redirecting users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://zsdbiopharm.com/upload/files/nozupezirilogibirafibasod.pdf In PDF document text
    • http://letresorellebio.it/userfiles/files/6189403839.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/dubevazi.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/muxebe.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/84213070727.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/faxipajedegopikoda.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/56920172387.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/bapajapekunaler.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/3835c97ce210c7ddd934c0467e0d0c98/57640056283.pdfIn PDF document text
    • http://watch62.ru/files/files/bulemaxonirez.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/80493059468.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/gezamimevenemebigidegas.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/nilosikapesasaduje.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/13477356525.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/49792450741.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/domug.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161329a5d693fa---85329706278.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/qg2lu9a019jh32dm0fhlmbp2qn/45144390217.pdfIn PDF document text
    • http://ossokahve.com/upload/file/55919753772.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/3305521241.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/gowukegafonezoweg.pdfIn PDF document text
    • http://szwygs.com/upload/86473543995.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/bunonuduleko.pdfIn PDF document text
    • https://jin-ji.com/upload/files/fixududaditufijaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=apps+para+efeitos+em+fotos+androidPDF 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_off0000e7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C1 10592 bytes
SHA-256: 7a6928b5f520fb39181707db3dfd8d82aa622fc1a90aa97d3241d3a4f09d5027
font_01_sfnt_off0000fff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 19420 bytes
SHA-256: edafa76e15b7d70d9a5302155599c03b16a495b2bff49a9d6a526b6a073e8088
font_02_sfnt_off0001304e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1