Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9e7073ddcaa538…

MALICIOUS

PDF

84.3 KB Created: 2021-08-17 17:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f13f8380abe36e5a2f9adb934a81ca9c SHA-1: 1cb81476b97c37bffc102702ca27f525474d83c2 SHA-256: 8c9e7073ddcaa5388da3e46c13f60f156b688873300c01dba951bba87cf1010f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://yodobashi-church.com/vamoxotun.pdf In PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770746c0e56---31828029501.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/rerajeripas.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/d79903f00956eece0c9fedb257d8ad98/janubezepuvewuwala.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/60467bc9a6e88477d3cc39dae4a3a1a6/34347734189.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608eec922c67d---tufasobugilojugifepexegon.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/losagilomibifisi.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/15631418341.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/zotizagubibexazaf.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/40928224003.pdfIn PDF document text
    • https://miruyuta96.ru/admin/ckfinder/userfiles/files/93050698784.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/33327618322.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/62634785855.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/1647721848.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/14548565421.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c880173bbb6---mimofatodawaxez.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/12562666704.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/256d5df3d5cbdad22997302d153e8b23/lizuberosexipafu.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a980852189c---24020029542.pdfIn PDF document text
    • https://miruyuta96.ru/admin/ckfinder/userfiles/files/97956398533.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608802e2e8d37---bevoziw.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/zawasulelimuleva.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/k4q5a93ag9fnoltaitjo3qhq19/gisirigove.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/tojojalon.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/9482766190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+see+serial+number+on+laptopPDF 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_off0000e3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC00 17392 bytes
SHA-256: 1a58772bfac475476d0db984e23e1afb80d7f1d40be133c0e34d7df1bdb24879
font_02_sfnt_off00012985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12985 10728 bytes
SHA-256: 7bfb8304bdadc4ebf5693cdb154c2cd20ea6432637d7aa7011b4b745a53960fa