Malicious PDF — malware analysis report

Static analysis result for SHA-256 6381b95e95ae17f4…

MALICIOUS

PDF

85.0 KB Created: 2021-09-18 12:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8cbd26a25ddf7f10012b8805ec33fb17 SHA-1: 0aa13730f16183bb8442e7f2fd54e7fcbc9bdbf6 SHA-256: 6381b95e95ae17f43678ca807675d904e2fca358a6144c0cb8f8dbb33187aef6
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=how+to+remove+chrome+from+my+phone PDF link annotation
    • http://polishingmarblefloor.it/userfiles/files/74891244736.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210917_074948.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/63975153506.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///sojoxafozolotuwupaw.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/fa7d1481e118c1d3b2d86e49598796fa/didepufoguv.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210904_6B47AC53FC298CF8.pdfIn PDF document text
    • https://led7.ru/file/fonar.pdfIn PDF document text
    • http://rentator.com/uploades/fckeditorfile/96242730066.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/1355478049.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/judazadowowerokesiku.pdfIn PDF document text
    • http://taigesw.com/upload/files/fomoxolarukam.pdfIn PDF document text
    • http://khocabien.com/uploads/files/vixoli.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/tivupezubiziruri.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/84795681623.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/b1505e0118b830070b5bd103af6dd1ce/palaremezomudiguxinoda.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/fegudepekezubogi.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/12530596999.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/68636786678.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/rugelogaxix.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/xawotedipasutibudifiz.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/jumaxegekelu.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132a6cc4da2c---42501027696.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/32804119384.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/c58241fc4ed9af850be0fc26db682e93/salejibosirefapovoraderir.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_off0000e880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE880 17600 bytes
SHA-256: 3fcf173d327b2faa4fc8a9079f0f5655c1ee6e562b9569d5bc5dee27ded3ecc4
font_01_sfnt_off00011656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11656 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6D 10536 bytes
SHA-256: 58f1f26cbfa67b274460fb029371a12f42dd7fc884509048bcd7d0aa1616f759

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