Malicious PDF — malware analysis report

Static analysis result for SHA-256 05aef107b5fd393a…

MALICIOUS

PDF

88.8 KB Created: 2021-07-26 21:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: 04e25c2f434cdf2d008080def00e4413 SHA-1: 146db838d6b35734cc0e6d429efc766273825211 SHA-256: 05aef107b5fd393acd5312aa4e2bac01cc8f51af8483af32bc24bdbd53722dcd
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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://petrduchek.com/files/41882306179.pdf In PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f347dbfa2a---vufijubelenegevizu.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/0eb4682ced3490d9d4d4d42c98718030/lubinukikukebag.pdfIn PDF document text
    • http://fotossc.pl/_files/file/ritiribemuminok.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a12476b31fab95526d6e9dd60c7ec286/74110379480.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/m0tasq2v7gvppq04hp1esof003/1310436677.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30838ac8c0---3983478937.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/94199508562.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1607e484f3664a---rugomolisofezatavur.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160982ab605603---mogesusuk.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/11575884192.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/itogsfsrtm13kh93vfas6vk1c1/77475381616.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/78062061792.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160f0366fb36ca---moxudedupo.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86207022f0---sonobefojujuraboduk.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/47999261310.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/e2a4a1194fe99524ef62d31f40a34bd3/72451905084.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20217211036581552.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/rotupaputa.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/rekugikuf.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/60033485955.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/18b3332f84dc37ecf50579202d231f96/59703631620.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d649b4cca3---44218238919.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/xelafipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=solucionario+libro+biologia+y+geologia+3+eso+edelvivesPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/84219878068.pdfIn PDF document text
    • 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_off0000ed65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED65 20300 bytes
SHA-256: 2b25ac71356ba18169a4bc1d4b99b6ef555c0397b48b609c5a6fea220a21cc98
font_01_sfnt_off00012123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12123 11112 bytes
SHA-256: 6a8bb458e4ad23b88a03c1b6b742337e05b4893e787a9fcc38187a5b0bd264f1
font_02_sfnt_off00013b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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