Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16216c9e4e77e0b…

MALICIOUS

PDF

86.7 KB Created: 2021-07-02 14:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a7154d21caa736ce98c05368d3333673 SHA-1: f86b83cd0c362c315d3f9c57bf776626be771d20 SHA-256: c16216c9e4e77e0ba4d9e4580cb496f07465c1bc99a6e093958bd920e1577259
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised WordPress upload directories. These links are likely intended to redirect users to malicious sites for phishing or to download further malware. The document itself appears to be obfuscated and lacks readable content, further suggesting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://ketchas.ru/uplcv?utm_term=synthesis+innovation+examples PDF link annotation
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607285a936b30---75930213968.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a14c13a4b8d---30136417559.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/56933303989.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e698268da8---xotidilixokozew.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/74604697263.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/jdhlfnfe3rrg8jsbutslfio77u/zudazulekedifawoxineguda.pdfIn PDF document text
    • https://akemi.ro/hirek/file/55752163197.pdfIn PDF document text
    • http://capri.lt/userfiles/files/94590897510.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/6656781cdb93a29fa5e12006ace6a9e6/69591590823.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcdefdea4f---filimi.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/17094272543.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/34368910971.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c729b067529---49913487887.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608046e2468a1---fenezufuk.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1624575320.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160744b2f79d4b---90124138226.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/946b7ac3c95498123d28338b7c81a139/49960494820.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/a2e04109f7118deee3c2c4e17dfde305/62553071661.pdfIn PDF document text
    • http://santeh.md/img/files/puvajixikomaran.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/juzejimogasazodefakedegux.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/b0ff82a4ae551261f85d98cedcfe1974/56841640415.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/215g94id21f1566j88pdim8c92/nerewutalafogedejexoran.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/b923deb117438f6104cd93ec0c03d9ad/69523502142.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_off0000f039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10850 10772 bytes
SHA-256: b7fbd6ed226c5f143790b085d23c8be5f392b2bfcece90e96dc5042c9801d1fc
font_02_sfnt_off000120f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F8 17264 bytes
SHA-256: 06fe5c6ba7745fb4e7c092eae7d8fbc1202a874f2295499fdac9d0c79d3f8e6b

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