Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b9f9095c793c1a…

MALICIOUS

PDF

84.6 KB Created: 2021-09-18 14:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1af1b68df4d97c46ec4083d423fc0c75 SHA-1: 393042a11f3446c5ac19a09cb323f7395e89d070 SHA-256: 80b9f9095c793c1ac8c39d57c0a7d06f80a9681e7758d755f2225dc9514e0d41
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF contains a link farm, with many URLs pointing to compromised or disposable hosting. The embedded URLs and the PDF structure suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/25694785689.pdf In PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/74703937bfb17e6d95caa7f24c652865/11971883333.pdfIn PDF document text
    • http://195exim.com/datas/files/woponotudanufojeboxidozo.pdfIn PDF document text
    • http://195exim.com/datas/files/49338898990.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/lixexuxep.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/nejavop.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/gevesobase.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141add73923d---88079815230.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/45693027593.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/38697693916.pdfIn PDF document text
    • https://network-italia.com/file/77677422649.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/52988899038.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/genoramuro.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/9836608077.pdfIn PDF document text
    • http://hkacca.com/userfiles/98736527011.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210909181107.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/fomeneta.pdfIn PDF document text
    • http://olympusflights.com/files/files/73476270133.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/fe600ab992e99a62b44d481cb1fbba1e/ninakuxurob.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/92441055044.pdfIn PDF document text
    • http://www.first-classlogistics.com/image/upload/File/91979873108.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/ruvibuwosedo.pdfIn PDF document text
    • http://domosplast.hu/files/file/59600867362.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/98446422159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=install+android+11+on+any+phonePDF 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_off0000e626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE626 17996 bytes
SHA-256: bf87ad39dc120a544539d6bb073e7d5d4795e2df7888713883f104ff8142403d
font_01_sfnt_off000114db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DB 10604 bytes
SHA-256: 40871e273befab41732b68668c8fbc1c73028d2e12dcee67200cf68bb004d583
font_02_sfnt_off00012d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1