Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a38d2232edb5636…

MALICIOUS

PDF

80.3 KB Created: 2021-06-30 17:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2bfb4ca55f7e5a14495632ab69a5974d SHA-1: d43200012417af37f338224b74ec045450896793 SHA-256: 7a38d2232edb563618afb7037a7c98f24ceff4e2406c4bb2035d0e28445947b9
164 Risk Score

Malware Insights

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

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 various compromised websites and disposable hosting domains, likely to trick them into downloading further malware. The presence of a 'download button' lure reinforces this phishing-like behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aep-tc.com/cache/fck_files/file/90889602449.pdf In PDF document text
    • http://austria-ex.com/images/blog//file/xilukelemuvajesemopub.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcb573db13---91989603978.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/lipomoremuvigagoz.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/16382091197.pdfIn PDF document text
    • http://contelex.it/userfiles/files/20720989793.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/eb328032dc66bfab9132ea82e3fa0496/jajupatewezow.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/c4f2db3354975924a2c0df794b893ffb/zugimane.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946f9da933a---poxutupominiro.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/et24u3j4la33aa17vvq0ft75ai/tunusageweza.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/19323499456.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/85079168040.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d091e4cd58---jatemugexuvisemuwulur.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/fivulusipujal.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/gifilivobojidasakabumope.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/sapekutowifaxavisexiga.pdfIn PDF document text
    • https://schmitz.cz/res/file/3580345537.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/19880245156.pdfIn PDF document text
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/cc1ac29f792b3f7bfc4fa67cc8db33cd/11027294606.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72dc66cb5b---26561252608.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/c59bbt4n49r135e38s85tvi6ql/gogedetebasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=powerpoint+to+pdf+converter+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD711 10596 bytes
SHA-256: f5055e90353f6109d7257cb2b27bdede5197771c6a4f7c9363ae9f6056cd9612
font_01_sfnt_off0000ef6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6D 17212 bytes
SHA-256: 0b959f366d5a204eb75c7184cd989d211611d0fecc3db0fd94a0883126e86abc
font_02_sfnt_off00011bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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