Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ca757eebe6e52e…

MALICIOUS

PDF

95.9 KB Created: 2021-09-05 01:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6a2bb31197054fc13817cd477e62d51c SHA-1: 82cc24b3e15f942fa3019b34719c8bfc3e0847e8 SHA-256: e1ca757eebe6e52eb1956e40a6cd34fd1ca894c50506575d1fb78f902761b259
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a cloud document impersonation lure, presenting itself as a shared file to trick users into clicking on embedded links. The links predominantly point to disposable hosting or compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

Heuristics 7

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://patroha.hu/file/sebuxivadepisumop.pdf In PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/i1bmh39hb9affog7ct5e7ubl7h/wezobivoduzuxafojelijise.pdfIn PDF document text
    • http://healthywithhart.com/res/file/sezekoz.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/fb11cd71123c615c6b9fe33e5fbaf70f/jakaxejojebedadakod.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c628ded7d88c3b584f25ba6d764347ea/bokatutesunejaw.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/f382475188d37925e477fc0236c67347/pebezaj.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/furixamof.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/99453535466.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/7905a2804fd556583f288c3beedc622f/midowawarogalokisufukal.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/wujiboli.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/sumetobate.pdfIn PDF document text
    • http://xnkvinatimex.com/uploads/files/pakuxoserizuwe.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f260708622---94331832269.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/18958517536.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/duboxife.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a964a9f06b---36883714890.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/c0f4f8b56dd7db7580eccae33886a35e/62957654759.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/rogitevileperusaligowig.pdfIn PDF document text
    • https://denimder.org/resimler/files/90818689431.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/278l72si00dkl558pvbma15mhp/55581305626.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/pufipogofuzafojowijusazun.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc5de45e44---bonavire.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/kulilagusoxuxexobekilo.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073a80f91ddb---87972633106.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/ef0ae573ac28cbedd91d862399f50b81/debezofovuwewuxek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=file+converter+excel+to+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65B 10428 bytes
SHA-256: 21f3b899c5f3120e4e21f375f42a493c9360ecfe015907846aba6caa464991cf
font_01_sfnt_off0000fe0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0C 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off00010603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10603 16560 bytes
SHA-256: 846e16878f89909e808678affd213a0abe34e09e62e41b9188c480fbbab4ad0e
font_03_sfnt_off00011d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001355f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355F 23248 bytes
SHA-256: 4662d6ad0ce5f59711c2e62d3b32a0bfe310a16ab48de047907e843aa7e342df

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