Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba2b2f027e52d5c…

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 08:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8ab3c5660434860a778a948dca77adf4 SHA-1: 6eb1508d0af9bf9140b87a3c05646612108403ee SHA-256: 5ba2b2f027e52d5ccfc6afde12db07c16c3858a4cddfe0f5622601a58982ba4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised or disposable hosting domains. The embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://studiotecnicoforace.eu/userfiles/files/jinefevokagepedobesapi.pdf In PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/33016976029.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/8557316411.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/renava.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/32913520722.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/jixisuveguroxadup.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/sisurakibonufepel.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160733bb71bc01---55921967662.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/zofibivotetukusogu.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/78375530400.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e2f6919e56e---80306516467.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/zimutop.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/75409114274.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/90758287401.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/fudewizijenixikedimujusij.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11888d70e7---zekisolesa.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44e5e4be72---lasowabapisizapefes.pdfIn PDF document text
    • http://socialsipahi.in/assets/ckfinder/core/connector/php/uploads/files/zigozujiluzategemuxeza.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ip18bku7smrbobd552fd5s8gce/zinuzidefezarixowa.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/gorawuvapiberufu.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/dbc83c1815071938a774d4b7fe99e1d4/30631619709.pdfIn PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/lamekepaxinibal.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/lalezegekedezore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=deletreando+palabras+en+espanol+worksheet+answer+keyPDF 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_off0000deb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB7 10832 bytes
SHA-256: e014bd66c490a61ac9efa6bf9c77ff864710a8d4c5d964915cb6b5f67ce11456
font_01_sfnt_off0000f781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF781 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F93 18332 bytes
SHA-256: 04ad32ae421fdc1a9e00b238b7ca34868bb7db09e8de59a71fa0b76f37eff939