Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e3e4c2a1eb2544c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-08 10:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 73fb2fabc78a36cf897829c4b3fc2f73 SHA-1: c037cad172db15986087714e817bb655e09641c7 SHA-256: 9e3e4c2a1eb2544c6734284f7bba1eb8476e6219a90ca10f136f53ac92363d24
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Multiple heuristics indicate the PDF acts as a link farm, directing users to compromised websites and potentially disposable hosting, suggesting a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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 http://shengnabei.com/uploadfile/file///2021061501211085.pdf In PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/9ueg2ri5f002v24o65p72kkd8h/31522800415.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9fcce1bea---39892582497.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf0361b2ad---morizovedowe.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/6137f2cb3a19c90dd0eca27e5a6de38c/99639286728.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/gurusanazaje.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/25431028577.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/tuxuruvozirozukoleke.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/35616372136.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161254ebaefc83---vumodajebamanoveses.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a87e5ea5b17---36323860060.pdfIn PDF document text
    • http://algeos.us/js/ckfinder/userfiles/files/bawukagidomutexaju.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/69315570028.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/93707774796.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/wamutatafibajezuri.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/90298348887.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/24576077153.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/15700228738.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/narivofono.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075ba875e0ed---94897818130.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/88130288258.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/65295788514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=functional+theory+of+social+stratification+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_off0000e213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE213 16724 bytes
SHA-256: 87a00b66c29beb6fbbbd1354a28b6c953f6a20bdd7654a17a2afa49bd6767b62
font_01_sfnt_off00010ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FF 10908 bytes
SHA-256: 1837b4fdfb69f7ca35558d24ec2a7cf97b51dce740c5619b514431bb8df6e17e

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