Malicious PDF — malware analysis report

Static analysis result for SHA-256 71dd92ce6c89e640…

MALICIOUS

PDF

73.8 KB Created: 2021-09-05 11:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 070156dba5b3d26f4696a093e0416b04 SHA-1: 511782129c0c524e1b62d19ff050048a1dcfa781 SHA-256: 71dd92ce6c89e640f859bb2c59c8c0c30b038f9a9b119f45e7223579e21828b9
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these links. The presence of numerous links on potentially compromised infrastructure suggests an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609253fad2d85---sizelepifuvuvo.pdf In PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/49057229936.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/sumuxatafilaviduvorinofi.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/91685102150.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17ae7742cc---xuwufarifosapo.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850a7cc47b0---10702302804.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/xinidikisemo.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ea8d82d0b---80870613246.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/162pabjukftt1ml9uc7qpp1tia/zoxurijunitiwiroxiwikuka.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b595e0374e---68633871048.pdfIn PDF document text
    • http://meta-min.com/files/bujejudikerivuv.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/87472976442.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/76282290072.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/7292dd1bd73ceaeeaad308f11cc7d3b8/zanogebitedijetewugasiti.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/2e503d6ce7ef4612b98e2d1ba556886e/gugiwe.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/51fb1e4fd29dc67f0bb7b4cc6fdeeb9c/zitolekevumimajukefixusu.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/36935557188.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/70526395212.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/39951244926.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/27372239916.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16112ee36e1f61---mogumix.pdfIn PDF document text
    • https://loctra.net/userfiles/file/vevumujejejawulumipep.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/fegajukom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=philosophical+and+sociological+foundation+of+education+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58E 17368 bytes
SHA-256: 9cf15710736e0e104513cc88584e15b2140d702e1795a0375fe13c23fbbf9ccb
font_01_sfnt_off0000df6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6D 10900 bytes
SHA-256: cbeec92c778dd8ec47dad07fcf42b81973ec19a9f8e6e2719544a7dd737b4a73
font_02_sfnt_off0000f861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF861 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off0001005d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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