Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ef9180a1a61043…

MALICIOUS

PDF

91.7 KB Created: 2021-09-19 06:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6a007123ae90c53b4d772f0f96eceb83 SHA-1: 3485daa2ca6488ed0c9ba7f18bb29e5ccbeb724d SHA-256: 81ef9180a1a610435e15d15a30f6114c0a462d08dd18a14f6a381a2769bddcb0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript and a significant number of external links, many of which point to disposable hosting or compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The embedded JavaScript may be used to further obfuscate the malicious activity or facilitate the redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mi-stores.com/basketballtotaal/images/editor/file/42741043040.pdf In PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/63184919545.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324c722e6cd---98450376292.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/bosaze.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/binonekivevula.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/pinebegepenifapivivalaz.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/funadopiwawu.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/pigiwituwobomivefisoweg.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/tikonixu.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161444419bc2f4---33459044032.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383d233ff6f---gekimipu.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/84725246692.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/1d228709d45a0e851eb7e38ea7570b18/97596418051.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/79386101856.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/61591476564.pdfIn PDF document text
    • http://bushurov.ru/images/files/zidozademeruvifenajita.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/gotofizuzazipemul.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/dorabiji.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/13560269153.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/kezusabovowuduwek.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/galugidejajebuwexenat.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/31250046576.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/3115226757.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/wudotinafusevidirasuzaxaz.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/95175951823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ps2+emulator+android+specsPDF 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_off0000ffb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB1 18256 bytes
SHA-256: fdf35cf1e2a60f127c068648f98ed5dbb2d5e0026ec6e78fe1765c4b71a36fe2
font_01_sfnt_off00012f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F95 10896 bytes
SHA-256: 2cbd67791472a7986a06289a53c1d37f082ff7cb8367f6b4611ca5f440757b13
font_02_sfnt_off000148d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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