Malicious PDF — malware analysis report

Static analysis result for SHA-256 e94b2d2e81f6e378…

MALICIOUS

PDF

73.1 KB Created: 2021-09-11 02:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 751fe1ed2d1f5c8114c1ccef31bc3cfc SHA-1: d7b242a95cc6dfd591203280a70a60984d868cd5 SHA-256: e94b2d2e81f6e378195b74893eb1280a89556953111abbdb14dc5f20e36525e1
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting. These links are likely intended to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3ead9f83e---vugotazevebum.pdf In PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/niwuvadazuguwiwus.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/vomofajesepu.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/fusodukifag.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/92173979421.pdfIn PDF document text
    • http://gojjang.com/uploads/files/32645457169.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/dc70c852139186263bc96b6daa8b1793/mimebolikatawe.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/lorudapabaxaso.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/komunixejamawe.pdfIn PDF document text
    • http://jinyezi.cn/upload/sagegetalekajigapeje.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/53895838816.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/vanuregod.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/pelarukofozemulavanatek.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/luzilupesusikazomide.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613334ca0494c---88314516123.pdfIn PDF document text
    • https://tl-systems.hu/files/files/divaxedutupuzipazolu.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/32228309953.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/zopuxisivisevudiwi.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/mabilexewogiveve.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613095236c1a4---48542251739.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/12515680885.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/woxobivuvakobugemosavexe.pdfIn PDF document text
    • http://ashioke.com/images/library/File/nofujatunubuvekudawaxuwal.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/rimalutoxazoxorumivom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+transfer+music+to+android+wearPDF 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_off0000bbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC9 16424 bytes
SHA-256: 2dfaa34ebd0e7f973f7b978eb50a2795f2d3cbc78b8cdc24eacc7f3d15da5d88
font_01_sfnt_off0000e5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC2 10768 bytes
SHA-256: 36ce21a0b44d9ecb9a5524efbaf852fc6796b7a80ef971d71ff28e511e0aa064