Malicious PDF — malware analysis report

Static analysis result for SHA-256 16611fe06ea5c8aa…

MALICIOUS

PDF

87.4 KB Created: 2021-06-28 03:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebdd9268de6c4935ebae402576d12a03 SHA-1: 105f8e9e7a843c4d05c1532267154acfedecfc98 SHA-256: 16611fe06ea5c8aac2a6951a74a88b70a8a9d4b4712274649d14e554c6a0924a
164 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to other potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these external links. The document body was unreadable, but the presence of multiple links to disposable or compromised domains supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://oniceh.ru/uplcv?utm_term=watch+online+mission+impossible+ghost+protocol
    • http://safaraval.com/basefile/safaravalcom/files/pezusekufojomuj.pdf
    • https://protradingindia.net/userfiles/file/bejesup.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/4riqebnqm9oo2dekm0pe02vptm/46480919239.pdf
    • http://cuatro-pr.org/sites/default/files/file/taledig.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59d1eaead4---wixur.pdf
    • http://buergerforum-tirol.at/file/sobavopugetufamofimus.pdf
    • http://abwlargo.com/uploads/files/bebemuxowi.pdf
    • http://cameradungphat.com/uploads/files/zivagojavinidibanijowef.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/ae8d257bd23c005e7b7aecb8f87c4d06/wovubek.pdf
    • http://artospace.com/pics/file/jelevumanedafagigoxozizuj.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/91605b1cda477c71b21855708ad8a5c6/94295573582.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/9c2aa4637f794ba0b30bbe482a071cc4/jelerinobusipasuvutiguli.pdf
    • http://workcoop.org/fckeditor/userimages/file/20210621143748.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076665a4cec4---figuvapunigoza.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608664068849a---63766801901.pdf
    • http://tamlaproject.com/userData/board/file/dugonerekovajejakafaw.pdf
    • https://gs-hemeringen.de/ablage/userfiles/files/subabuj.pdf
    • http://mjacz.cz/soubory/files/zejegosipolorux.pdf
    • http://khodahoanglang.com/admin/webroot/upload/image/files/vapanexobexuwab.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdae171521---61000578226.pdf
    • http://dochoiotovn.com/uploads/userfiles/file/18253951647.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/tajowaduxemezok.pdf
    • https://fablab808.com/nbloom/fckuploads/file/77084832950.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/9ec10a1fa106c604e9f2346a7d11dccb/wuwusufejogosuvade.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/97731327225.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da23224e5d---bufarum.pdf
    • http://unesco-mediain.cz/fckfiles/file/mukekebasofe.pdf
    • http://bostonmentors.com/userfiles/file/guvonadizerafo.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_off0000f046.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 16792 bytes
font_01_sfnt_off0001085d.bin
c47fcbfa28abd57e9e25d0f97d2bbe98f590895db8e95765e4f6f9f948381e7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 10956 bytes
font_02_sfnt_off0001215b.bin
26b52ed7adeb19f76f36767da5c04a2447869c55e595852e73ad4cceb900b1eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1215B 17628 bytes

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