Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4f4c4d55b15a25…

MALICIOUS

PDF

75.0 KB Created: 2021-09-18 13:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b13ac7d1002c3cf477b7ad1f5952ab3 SHA-1: 9940e2b3d1ff3acde30156d9c970ebb65524916c SHA-256: 3e4f4c4d55b15a2544380854faf9136689ecc0fbf3c5b037f54d8dc1cd25f4c1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and multiple links to other PDF files hosted on various domains, some of which are identified as link farms on disposable hosting, strongly indicates a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support the malicious nature of this PDF. The embedded JavaScript likely serves to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/p5pe6ih97fhncpmu04go7sg5d4/kapikafa.pdf In PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/xokojo.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/buporadokibijom.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca2b4b615d---51103810997.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/bowedinopebegevab.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/38770952280.pdfIn PDF document text
    • http://china-guolin.com/filespath/files/20210901231459.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23297644329.pdfIn PDF document text
    • http://geraldinekilkelly.ie/47327371854.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131799be3059---wusosixasujesesutav.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161342eedc37d3---lizadogilavuxe.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/54042737792.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/tinezumifot.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614088ca8c139---97168684064.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/42225842731.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/webikejazakagazif.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/43979825200.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090407522749.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/rexudolodojixuvugepemisem.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/kamajubapupa.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161344bdb4acc2---74963233696.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/54632068387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=chuchel+free+download+androidPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139672b33875---77058706710.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA4 10524 bytes
SHA-256: 68bfd73026de42a43d6ee046af69d58f0d48855b7bcb6bc43c02669d4f624dec
font_01_sfnt_off0000c78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78F 17604 bytes
SHA-256: 8238701e7b94a065d0371c0a0400ea755d193e518a8574443c21eeecc996abb9
font_02_sfnt_off0000e266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE266 14192 bytes
SHA-256: 936026394444904f7d533a6e53bef270264bf33d0afaddb732349b5ddf23fb3c
font_03_sfnt_off000105ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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