Malicious PDF — malware analysis report

Static analysis result for SHA-256 adaab63f01ff2d1f…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 18:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 440017ec97297faf8807d5f10456c47b SHA-1: be1ce5f649260f899d913e512d17b75ead744252 SHA-256: adaab63f01ff2d1fd2bb22300c7b9af02aa283a8548250a4c705e0c40972456c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs suggests an attempt to lead users to malicious content or phishing pages. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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://nomylo.ru/uplcv?utm_term=csr+racing+2+obb PDF link annotation
    • http://lor-rostov.su/userfiles/files/gunowujanopumurabiwugufan.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210914_115049.pdfIn PDF document text
    • https://kawanmto.org/contents/files/44275250178.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/9600634541.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/24590270190.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/zanosewo.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/supomiwukegejofeki.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/5117234682.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/gumitevusaxemakivatanu.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/pefugo.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/j2d9nmhae9evqmop15f2kfn135/47164092410.pdfIn PDF document text
    • http://novafish.it/userfiles/files/kezusukunewimakapuvo.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/rizadoxom.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/pesirezenar.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/65042664274.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/56133662142.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e06b4c709---bufuvafamevuvomipakire.pdfIn PDF document text
    • https://promise-land.com/upload/file/topurixiwipodubewug.pdfIn PDF document text
    • http://vladekoservis.ru/files/90935997739.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/31851816091.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130008ecac5b---4947229953.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/65972333927.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/dokumapap.pdfIn PDF document text
    • 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_off0000d3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B4 17652 bytes
SHA-256: 135144151bc0c03e50da55849a9ed8b47b2844b5fbc5f8e33ad7d6b401a29768
font_01_sfnt_off000101b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C7 10420 bytes
SHA-256: f05f2892b926d2a7b218dc8cd71ea8c889b2088b1192b5f44957613bfda0bead