Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d23ab33053a5f9…

MALICIOUS

PDF

70.5 KB Created: 2021-09-16 10:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a95455b6c36002b822ef8e775a2c6e9f SHA-1: 9764bcb4d4fd83b1fd010fa01e3e3e6f37f75259 SHA-256: 64d23ab33053a5f93ab76da67a2eba71cd7639269b8c63d343b372bc4c432d66
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. The heuristics indicate the PDF acts as a link farm, with many URLs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute phishing content or malware. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://merlak.ru/userfiles/file/92940052699.pdf In PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/1d268ac2fdeefcc60fc1dec78b09affc/17960747882.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/31084078411.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/4272b8146719a04c58730e19bd5f717d/jumojapog.pdfIn PDF document text
    • https://fptica.ru/images/file/rononigupugirowamilerut.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/63387654297.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/wapiposigofokatudixe.pdfIn PDF document text
    • https://partetesal.ir/data/file/71165155969.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/38379315264.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/9854416390.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/78453366135.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/lazejimerodojenevo.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/fiwirexibulivofajodum.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/masepovuxelizino.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/wikililemumodipabar.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/xesopam.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/4973019204.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161425fe8d3679---38460154911.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401b2189688---19041199299.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/27bkkbq8h8hdt751u1feslfr37/17357106449.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/febofub.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/xememulajukag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=number+validation+in+android+edittextPDF 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_off0000b37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37B 15852 bytes
SHA-256: cd88b7862d742d1c816019577f0033fa99eb7601875f340af5efa86adac51666
font_01_sfnt_off0000dc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 10624 bytes
SHA-256: da3a6838e50f87eaff949d846a2be109f84163b6f9901c8e170fe7c9216b095f
font_02_sfnt_off0000f49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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