Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdaf973bf2aff974…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 10:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 484c8b14df0941fb4f809ce93e12b937 SHA-1: 68edec103411afd3b0d7adafa5164b8070a881dd SHA-256: bdaf973bf2aff974c2127cc4f53f95aca2ba32748c7afa9633faa2a4f980c8a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The presence of external URIs and link farms suggests the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://coretry.ru/uplcv?utm_term=odin+apk+for+android PDF link annotation
    • http://planetamama.ru/files/file/didabub.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/garirorazagudutuf.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/74480203516.pdfIn PDF document text
    • https://vietnamwelder.vn/uploads/news_file/84088500693.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/sajuxorikapubejowiwusog.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16305425581633871560.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/19375805664.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/zopatisoroxikejexojukutu.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/54996582065.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/xizedapebenewi.pdfIn PDF document text
    • https://fond.ru/userfiles/file/rujelejujoxux.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333bbc1fa82---nogijewujesozejupifo.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/21224650112.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/84731606803.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/98812027846.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///67861238132.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/xelirazevevelixasux.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/dipagizijusalefadaxegu.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/gigogukejikajodo.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec68bb7410---8964811819.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/74346421029.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/15204200608.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/6b84ceddfb7daf17022efaadb3f1f902/lipepu.pdfIn PDF document text
    • http://prosquash.by/data/28888799135.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/46037728124.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/rakorenidavubitanasifiwaw.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_off0000dd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD41 10164 bytes
SHA-256: 1e3294e61e5eca4850e0598f2dbfc986685fcf3c93dc08d20792322caa1f2bd6
font_01_sfnt_off0000f40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40C 18420 bytes
SHA-256: 78ace63346d92b88f9085f1e0c435b8dcd635bc104cfef4cc940c5e39caa2376
font_02_sfnt_off00012418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12418 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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