Malicious PDF — malware analysis report

Static analysis result for SHA-256 89186f95aaac7e3c…

MALICIOUS

PDF

72.6 KB Created: 2021-09-25 03:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 305ceb51c427e3118ad430735dba1778 SHA-1: b5f109efdb5755b094c37008b72b728e7f85af44 SHA-256: 89186f95aaac7e3cdec0323dc4d3ac82ceeb17c9162a1cd8c0ef009827a666fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=live+mail+log+on PDF link annotation
    • http://khachsanmyngoc.com/upload/files/tedelina.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/rozarajunanomubig.pdfIn PDF document text
    • http://fikszo-whc.com/userfiles/files/wusifivoxevetatovibime.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/39947112900.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/nematobeveb.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9cc623693---67469468286.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/8046122881.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/2654572586.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/72643918405.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021091317113289.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/17575352120.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/regibukivunurepobomijex.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ppbm7o13agmid291ds6a761ssk/25888166544.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0ea40c71b---surob.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/71536398888.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/kevinesobason.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/10951003510.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/67348617034.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/paweteva.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/0042fba6fdccfafdf4f35fad53e08885/37538703611.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/55220089411.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/rinejenakuvago.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/7289470123.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_off0000b6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A7 18704 bytes
SHA-256: 53f77e3608dbc8083c466892ca7aad405614aa923fd0f0ce4e7f9e78d1d6c444
font_01_sfnt_off0000e70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70A 10108 bytes
SHA-256: ba434df8ad3712b8d9df706c0c7ff38a6ecd0dcf8c591fedd0d1f626ac09fddd
font_02_sfnt_off0000fd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1