Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce6ad856cf5ea872…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 17:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 750e5f13076273d4217f7104594a383e SHA-1: c05bccb2e1d0e1f93f7b8ae1048f3357b1d3b3a6 SHA-256: ce6ad856cf5ea872224bd855d12cc91da9cd55f3327918abdf9a1c8e94ccc2d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' confirms its malicious nature, likely serving as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c4092c8bbb10dd39749b4e32cc220ce6/84281851422.pdf In PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/91798cafa667a956677e293a8aaa83ce/54120664416.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/wuxafizabulu.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ee72c22d1---xegolax.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8b5c95c05bdad6177be787382f0113b8/rarak.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/e0e1bca48cf1e657e9c4e0ba0b15c488/9376476137.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/34777804894.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1f71529c1---80732255903.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/74376681259.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd75a64d10---widamekisuzewawagowaja.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/dusepezenesojupewuru.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/dmp7u7ft9dlnjm4ir1vntjoptb/44677426732.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jrp0q080i5eef5qi4ncbk5jot5/70324686809.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/nadimuverisoduterove.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/5h7m85p4lehql67n5ta53hddn4/varixit.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/semidugufada.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa64f90408b---korigefi.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/kuwevusepejorup.pdfIn PDF document text
    • https://mszukam.pl/dat//file/97612137539.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/2ca6464836bbf0e4d0923dbd0498d1f8/90396971300.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/fedetutopozarofo.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/79326237117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=logic+worksheets+for+kindergarten+free+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_off0000dc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2F 18104 bytes
SHA-256: 9e4b917dabde67865268f83f0b1f4c2cbf7e234e72e2edea892b508628eada6b
font_01_sfnt_off00010b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001238c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238C 10888 bytes
SHA-256: 3cfe0d8248d320c1c4bddc29d77b6ad282a6241357ad5353c2ff9d09dfc6a84c

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