Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8e4ea61dd10fb2…

MALICIOUS

PDF

88.5 KB Created: 2021-09-16 22:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1e36a5b2c95a355f3a09ea700e7c66cd SHA-1: 0e4165bbf7556bc53c4edfab32cccf8cf70992ae SHA-256: ca8e4ea61dd10fb2b59d2b49c9554920f64e4eb67198f10f737981cadb4d7db3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://1000projects.ru/upload_picture/file/69032106253.pdf In PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/nuxojalevaxowudopaj.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/fizojamuwike.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/78612504894.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/gonaxutitawe.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/290909defb2e2ea0a3db220ddc786c23/64583450231.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/96833838123.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161433fee77535---sidadigugo.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/tavuvunujuxejima.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/pixaw.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/16318733998.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/7f3e0e3722389d3d91c946ce25ca061a/66094195789.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/50979848462.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/32249542505.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/78406054394.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/34141161283.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/jigiliragowexanekajuvikuw.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/jiguwodaled.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/bizuroxalifogudamo.pdfIn PDF document text
    • http://www.bash.cl/media/file/nawasarali.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/buwegemojivep.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/83082751964.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/pezabusoges.pdfIn PDF document text
    • http://pb-book.com/user_file/file/68484298560.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/56619166123.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/72946516954.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/rikiwoginutasixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=live+cricket+app+for+androidPDF 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_off0000f6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DC 10516 bytes
SHA-256: b9aa985e503d5ee0c902cada42d67a8d358462cd605abae8554600539096ff48
font_01_sfnt_off00010ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF1 17620 bytes
SHA-256: 47e884e26b2a5631d36c30fece0a4f22729c391e68c5e618587968ad247cc90a
font_02_sfnt_off00013c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1