Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea46bb83eb34b99…

MALICIOUS

PDF

113.8 KB Created: 2021-06-28 04:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 64dbe092262639d1ff8f055060cb0489 SHA-1: 75bcc36cc0538f16d0570d934d4bfae6100c47f6 SHA-256: cea46bb83eb34b99de3cf6f316a20f3a52ddeba2c1cd0fb4e8a18ced4f43c8b4
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, likely for SEO poisoning or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9855

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://crysiq.ru/uplcv?utm_term=mississippi+river+towboat+companies PDF link annotation
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/1a6fdfe29270b22b82ee1c45c5b73dc0/pigosu.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/raregatixidixuwujaziwuf.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/k86l2dakajlhhviuq8t2hvc3mj/jonar.pdfIn PDF document text
    • http://npas.ru/pic/file/79389116159.pdfIn PDF document text
    • http://armanetti.com/images/navumevo.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d967bd72a0---fikabasobeleborabofopuw.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/47927944832.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/40267040720.pdfIn PDF document text
    • https://birudongker.com/contents//files/libipogixopi.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/bsintep824pnh37sc7j7lh009j/fotepuxomimitiwopi.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/namiwikakorovijibere.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/96082735753.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920137a4320---bewusomem.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60959b493e---14093978380.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/wefezafasoba.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/70275346600.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/28998057612.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/kp252l6mc4h0ulu2rm8fmlcf2n/kujikitovezotadovusoma.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3e8def596---62424474391.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/69940112565.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/xusezaxewa.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c928552a3df---gipoxif.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bae43b973---vusipezujebovejilukowu.pdfIn PDF document text
    • https://wecareprogram.org/images/file/jerajitenigus.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/s21jm6bkmrojqkr54sonv3b6l3/31716898371.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5fada09f0---foxupoxebunujuw.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/69972147405.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_off00015738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F4F 10772 bytes
SHA-256: 93ff470075a6a10c2d08c36412de79dbd92d58a0afe51d4486593ceedd88281a
font_02_sfnt_off000187fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187FD 18836 bytes
SHA-256: c2bd2a4a3f97553cd77c1c0b564083e7ae37c34be774a8662a9b218ff3b2e8b1

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