Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1564cfb25f84be8…

MALICIOUS

PDF

96.6 KB Created: 2021-09-11 23:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 25ca806ffd48f98eb7f9d6c39d9b19f2 SHA-1: 373a8cf310725efa637997cf775f82b0f582bc91 SHA-256: b1564cfb25f84be806d9c9467ee169092e8ec4054bf8eda7af6a2d6d9b17789a
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oreopay58.com/ckfinder/userfiles/files/92408348253.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acf5864d0a---39304474980.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/vumitepivelupunoxulinap.pdfIn PDF document text
    • http://www.moyekolodin.com/files/50482251762.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/paratomemitupaxe.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/6pveiq352cv32rtca42gapp0ss/28629680496.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/95651020897.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7c399fe46f30a37f4479d44ba02e2053/64183881123.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/pokilur.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/vafiwebikajusagixabex.pdfIn PDF document text
    • http://zl369.net/userfiles/file/sixavevidaviv.pdfIn PDF document text
    • https://eurotig.ro/file/wewapafudepasovujuxajet.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109030956112245.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/11613783704.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/67687394128.pdfIn PDF document text
    • https://svltv.in/userfiles/files/36850322152.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fed753dbb---48488313364.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/wupexuvovife.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/55698041899.pdfIn PDF document text
    • http://expresskaliski.info/file/43738874590.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/16f6fc44ab3cc2d7780c2ac9db99ac62/27431537247.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/tavonexuguwa.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/54023947318.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/gexisukijenodorasazuxiga.pdfIn PDF document text
    • http://ipllaser.in/uploads/16882753981.pdfIn PDF document text
    • http://shurll.com/9f7ehbengaliIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=badsha+the+don+bengali+full+movie+download+720p+blurayPDF 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_off00010e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E22 19084 bytes
SHA-256: efb4d4856d5b353c5457abec2fb03f2e22a1f634f69892e3a055ab78a741ce80
font_01_sfnt_off0001408b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1408B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000158a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158A2 11796 bytes
SHA-256: 24ebd4e6fcac74790d377487e55c0aff908fcc64d746d2664faba0b43ce5fa7e