Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e28e070761d2c66…

MALICIOUS

PDF

91.4 KB Created: 2021-07-02 15:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0429b74bd333f975ea2982761f65662e SHA-1: 6e351b23c36c7efe4758c2627360ef8cdc505a95 SHA-256: 5e28e070761d2c667837aa1eab29fcdd45e5509efe174dbc5077e17ea34c1eba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609faa60597a7---67807273559.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609948d05e6e5---20956833259.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608511f703390---9560492060.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087b5e2bd745---18025087180.pdf
    • http://www.tekkoo.net/images/library/File/pazini.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/011f1c1cf8af32aa272e6b3145a02535/75046574938.pdf
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/gilifetogaxutam.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b92ce76fed1---92813919279.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efb2ad28ac---votolumukozixono.pdf
    • https://pasarantogel2.com/contents//files/27106836454.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/s37ngodhboobdkpi7sfchbebqi/fanusugetufugesivese.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/tetujo.pdf
    • http://beytarimcilik.com/admin/editor_resim/file/pefimukutarugotigavizavef.pdf
    • http://exmar.it/foto_fck/file/79889287080.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f7e5acca8---gutojudibinatutodurabepov.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/93107213659.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160825f3f5c6e6---xuvekuje.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aee350798b1---matavudomigen.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5db17e62cb---96603329215.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b53163e1a5f---18013632532.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/92tf0nm2a284hcv1uoocbrhilk/48746165526.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df77fd6bee---62793442138.pdf
    • http://cdmatik.com/uploads/file/94074807632.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/fituruguvuwivuresufi.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/e02ff096b13c17f2d08dde1156ee477d/23640875722.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=if+there+is+anything+that+you+want+beatles
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010171.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10171 16792 bytes
font_01_sfnt_off00011988.bin
db7a1ad708df09813de5201a879905ae3041337ffd23085ba335278105c0bba7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11988 10884 bytes
font_02_sfnt_off000132bd.bin
2efde2b91baa3c667b21523939a4b03043a53c4d98164d72add51f92cdfe3a95
pdf-font-stream PDF embedded font (sfnt) at offset 0x132BD 17468 bytes