Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f583ad5a8f8beac…

MALICIOUS

PDF

88.9 KB Created: 2021-08-10 14:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 07dac8d63dae0488398d40586e1af06e SHA-1: cbd9ff690086fde507fc9d419e9f6ca3b3724b2c SHA-256: 8f583ad5a8f8beacce4fd0547576a1df9341c42859c95e8baa2010c5c4dbd9c6
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, indicating an attempt to redirect users to malicious sites. The presence of multiple external URIs and link farms suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://cobbpaynefamilyreunion.com/clients/862770/File/lizupejad.pdf In PDF document text
    • http://ztkammer.at/uploads/file/kituwolodixupuwi.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/12105442d9372333c8e4d65e3e84a9c6/31718994971.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/bomozarifufokadi.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d971eb57f50---55612924128.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/32d1589447fc397c840f20eedd48c017/62779834620.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/f1a4hi4g2u77836nrccqe35gof/12809620592.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161053d42de78e---32474504704.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/065456960d5ca29c8f9e435c3f6ecf5b/90068625831.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/nepifumut.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/negamorigegojirekidododi.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/nipokemon.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/1740662311.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/p3k0f3828q4a530okmpsrnbs94/zoxuz.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6df2391363---nalotedozaf.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/14437966509.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/43584085865.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984f63e8380---77091966172.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d5cb1e12b---berovuzuwazojajul.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/wavigijudutabisoj.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/8b8cc4cbdd5f023027a64a7114eca719/dekiginumigas.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/lakefuranejas.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021051705354773499.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160997c5ce4b1e---namadulezawat.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d30e8ab2a---86744136737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=media+geometrica+exercicios+resolvidos+pdfPDF 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_off0000f07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07B 11020 bytes
SHA-256: 9a1571b87d8e59f1889de7c7b7af6370ce94ad6522dcfdff3e1c7bccb31f6d5d
font_01_sfnt_off000109fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FD 19824 bytes
SHA-256: 145cc113aaa3c93df7e87e1a871a8ef8940dc1828b238efa24398c0938a3b17b
font_02_sfnt_off00013b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1