Malicious PDF — malware analysis report

Static analysis result for SHA-256 91553e97ac7ebf5f…

MALICIOUS

PDF

77.2 KB Created: 2021-08-20 06:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 747d377b51cf9b4359bce65d55884d72 SHA-1: baee0fc1f621245e0a60c546d0792e0a04067a75 SHA-256: 91553e97ac7ebf5f4876bd8b6dfb0eb85bbdf4eee127509de000fec79056b57d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an attempt to manipulate search engine results or user perception.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830e361ce67---xatuzuzonoselovebobol.pdf In PDF document text
    • http://septumdent.com/img/userfiles/files/30375135582.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160744bbcda9e8---95504118657.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/jp3s1q6fp2n5t07n6vjf5l53o1/2727486267.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/70503975181.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/14284e94bc53998e9e30a1e02617280e/tavimobadu.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/1keu69v8ors7vnffjb1ld88ccq/pifopefiwomatisamuje.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/69144936881.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/35385492483.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/85946eb0b39ccd3ebe844ea3a30767f0/dowagudulobesudujeget.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/17246731800.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/zefakubulimefufome.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/nebuvidipo.pdfIn PDF document text
    • http://ridendo.cz/files/file/ravazijenipodurodaxunik.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/lozasugigafurajitedemitug.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609375467dcdf---xanebepasofego.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/4618860723.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/89617953737.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/mafazew.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/3cf5f4a843ad96df62233541e3fbf77b/12910945695.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/sezigopajesutixanexe.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f0a2588235---33207522509.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/noxisojatikug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=kamienie+na+szaniec+sprawdzian+z+lektury+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_off0000c625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3C 11104 bytes
SHA-256: e464689c0f25975b2bdd73ddd7de633a698854e0497c4285d5023ae30d528b2e
font_02_sfnt_off0000f82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82F 18112 bytes
SHA-256: bf28ebb448e9b3d603e4e866055450661d02920d1c8da2ea044e9d1fe6c7c1c8

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