Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1ad3c783138df1…

MALICIOUS

PDF

79.2 KB Created: 2021-09-07 15:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e4d0044a687088a3dd8d9340343ac23 SHA-1: 6305deb08c69f00f1d444a2d4cdbffe6c98cbf84 SHA-256: 4c1ad3c783138df118a45e7c618a8f4732e88c53fcc66cb940f753496921f7eb
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised CMS upload storage locations and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The document body is unreadable, but the heuristics strongly indicate a malicious intent related to URL redirection and potential phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/98991229436.pdf In PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/67827177981.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab48347a110---nomuwukirodiluzere.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/u5khfnea884kd7hpl70peqs0r0/ritis.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/18c199917a83ce74d67988e03d4e54c8/99875835293.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/97898378022.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/vebuvavotarudig.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/7579100280.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/bixonade.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/78519794049.pdfIn PDF document text
    • http://waltonjohnsonfamily.com/clients/870437/File/zikolepigeviperewen.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/kalinusosimesigimugufu.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/82151284673.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16096c0497d3f0---visiwiretabozeseni.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5ab57920d---22587894775.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/saxedi.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/36491832464.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/18189737003.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/l47r8ljfcbkjbv6o9rh286p9l3/gosomaforunevibe.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/16774696606.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1559a839b---levagutokabujubidevufe.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df69d267a6f---14473208128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+you+manually+update+apps+in+ios+13PDF 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_off0000d007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE819 18020 bytes
SHA-256: 42dc7a2469139f0d14f16c7dbf362ea3cac420898b6d66c9e05f774c14b7eed0
font_02_sfnt_off00011604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11604 10968 bytes
SHA-256: 43e7c46339efd5cccba95a691774ee746410e937a1c7851cd1c9e99e9b6de15e

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