Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87f25af064cad1e…

MALICIOUS

PDF

85.1 KB Created: 2021-07-17 23:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4baeef3d5bbc76a08a991d89579140bd SHA-1: 49dcdb3f0caffad3c32043111a2d20aa7e17493d SHA-256: b87f25af064cad1e08aaffa909aa73194d8b268bdc3f508b58bf7bf37c0f4c10
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories or other potentially malicious sites, suggesting it functions as a link farm to distribute further malicious content. The presence of these links and the overall detection profile indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://leebyunghun.org/new/upload/board/files/1610351900.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc36109a65---29038006558.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/23686662839.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/4660b88b2171bd21c0eb4d27a5a19a7f/12590775066.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/vnlk5svhbvir02lvseq6ucd4hu/91242418133.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/39226671367.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/ef02afefd7e2a0cea99dba633fc63c87/16563866500.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/gimemitujivugeranejomudol.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/sudimoruxobelumarejas.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/39310221092.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/39019938807.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/48877432480.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/zixalag.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070748277e89---8464969044.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/manip.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/waroregozanolajoru.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/4896177446.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/sobovozixuve.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb7d651256---litakuzis.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607daffe8e012---94991935585.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/a558u0u5u3svo3755jaoj97mv9/pipagavovigal.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8dbdb7094---mozoxiwo.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/oeraglr6lk56v92i6khib9bll0/wosatovigeguxarokuzaza.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/1f27639d74805abac453ace7b288eb25/kepunewoleso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+long+can+i+change+my+belly+piercingPDF 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_off0000eb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB43 10888 bytes
SHA-256: 7a2e6b4e8488820270a66823fb6cfcecf53d312bfe63d7f3ec3a669373f4b4df
font_01_sfnt_off00010405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C17 16756 bytes
SHA-256: 73954438ef9cc1754517a95c9856ddb99de2926290a5f4178a4a5d734e7ec041