Malicious PDF — malware analysis report

Static analysis result for SHA-256 8070a3630868378b…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 00:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b0be1d733f74a23cbb5315333e486b02 SHA-1: 05f988150b52f1ac670d70574cef5d1d556603a8 SHA-256: 8070a3630868378b833dd5d7ca3fb1abdb44ba7f23d8b2a7b6de6de1aa8b9629
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and is identified as a link farm, with many links pointing to disposable hosting or compromised CMS upload storage. The presence of an embedded JavaScript stream suggests potential for malicious scripting, likely to facilitate the redirection or download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wastran.ru/uplcv?utm_term=pokemon+dark+rising+randomizer PDF link annotation
    • http://hasdeu.md/data/userfiles/files/12194275720.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/fetiguvixig.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/vekutexubaxej.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/wivamuzo.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/23631409524.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/3396145093.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/buxitonofifore.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/kedej.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/tidedebetuto.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/d34315bb8de1f20621cbcac02a9dd09e/18340647506.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/fipumikobepufom.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/19005520715.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/veridadajopogeka.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/13566326056.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/88030193360.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/gamudad.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210920215729.pdfIn PDF document text
    • https://birotex.rs/images/files/49237088315.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/8724140095.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612fead1bd431---ragexas.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/20787784761.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/357bd8113398e5caf6f6298330faf687/28951363787.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/tafimuritisak.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_off0000b1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C6 10600 bytes
SHA-256: 9cc9b86e95b8baf211bc36bcedd362225ab126ce342f33caffc0e9830148ca6a
font_01_sfnt_off0000c9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DA 15816 bytes
SHA-256: d827f5f53ea2baf0a65bc550191589f41bb51d1f6d344b37f4a09bd2f077c2b3

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