Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2fec354ce266856…

MALICIOUS

PDF

72.0 KB Created: 2021-09-28 03:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0eacd7f3fa149c36647f1d16945a2b88 SHA-1: e58145bf2d60f5f405113cba194a35c6dc05aed7 SHA-256: e2fec354ce266856a090a39a180058c36c548d527719b4a46a3a8e9f5a65a8f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed for phishing or malware distribution. The presence of embedded JavaScript, flagged by heuristics, further supports malicious intent, likely to facilitate the redirection or download of a second-stage payload. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://cructi.ru/uplcv?utm_term=download+aptoide+per+android+softonic PDF link annotation
    • https://lecachet.fr/docs/files/sabigamepeter.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/tesifelexaneridut.pdfIn PDF document text
    • http://scpt.it/userfiles/files/kefuwaxenujak.pdfIn PDF document text
    • https://cowik.pl/upload/fegunarakupelalafikevajad.pdfIn PDF document text
    • https://pbanerjeeservices.4digitmagic.com/userfiles/file/45601908379.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df8bf9d364---67998650342.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-18/20210918130607980386.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/49778532130.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/vinuxatasujufekizixoz.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/wosawafegejoxutut.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/37169238471.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/20225968704.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/3916825808.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/xewarusan.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161489f9c9ee2c---foxizumovakurufuzalibaf.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/7496764104.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/nukavegaduxe.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/nusogalokosilizo.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d2d10d4c3---vawiwaselol.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/goramamuduxujawimofasegul.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/feganakumad.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/91342102448.pdfIn PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/11557032790.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a8b4cc20b---55555998370.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC10 17200 bytes
SHA-256: 8e4d0d589b077733e30a06d5c5da0d61bfc3abaf289cee64fea000c6b54f8fa8
font_02_sfnt_off0000f7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DC 10700 bytes
SHA-256: cb6002088f01076f909fc5c21d895ec949b0f3aff3256afe3f0e9967918510d3

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