Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd3810757187b69…

MALICIOUS

PDF

84.6 KB Created: 2021-06-28 03:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f9ab599358d92c43fd6e11a5cf63ff3 SHA-1: 766c4cdd90007636d88ba0575f6a3b2f10c82dbf SHA-256: 8dd3810757187b694409438b0c87fc67fa9bb3459bae81789b28a7cbc5b6f7e4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other potentially malicious domains. The embedded URLs suggest an attempt to distribute phishing content or further malware payloads.

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 https://pistant.ru/uplcv?utm_term=hope+is+the+thing+with+feathers+worksheet
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d27af8050a---jopojewifetowenosejevata.pdf
    • http://tcihk.com/userfiles/lebudejedalov.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/visq7ar3tum5jl8r7kesmcihr0/59456324771.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b23dafd649d---pafuvebun.pdf
    • http://tinnaduraflex.com/uploads/files/98198564430.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5c3d0cc2c---91543856815.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/54856587238.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdd906f241---22874259992.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/aonk6jdoucin24hlp6pumbpnj6/kosebokiwebizusuvegun.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/65d5573fc93deed5276b0bb8a7aabf6e/75510412482.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609c41e94a8ae---5407362039.pdf
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/nodesawunivafori.pdf
    • http://accu-chek-event.com/ckupload/files/refosimavuwajukesit.pdf
    • http://bobmeetin.com/media/galleries/files/litek.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/983f52b93fc4468a70e5940751527f5a/14924346411.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b235c2e8c3f---lawefadoban.pdf
    • http://tamker.hu/userfiles/file/36214766232.pdf
    • http://bean2beenefamilytree.com/clients/60578/File/dobanofofojijofe.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9e6b0ab1f068e01dadace3126c7bed05/datosilalofodagudatow.pdf
    • https://247hvac.ca/fabulous1/uploads/files/92950441889.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/1b6e1669d9144f1f5da474d88c6d0ffa/43502692954.pdf
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/58857598916.pdf
    • http://northcity.rs/slike/files/wotoxomi.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a871fbfceb---xepawirajaketoj.pdf
    • 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_off0000e638.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE638 16792 bytes
font_01_sfnt_off0000fe4f.bin
d3086e6ee37e8d89bcf0faed9b73ffe4c901a96281738c333aea3c45fe220a07
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4F 10760 bytes
font_02_sfnt_off00011715.bin
252c3f6d826220c618ddb3646a24d3468ce454b0d49d5c1b6f9d8df2cdf2bbbe
pdf-font-stream PDF embedded font (sfnt) at offset 0x11715 16976 bytes