Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1bfa1e3a9afc71…

MALICIOUS

PDF

69.0 KB Created: 2021-09-30 12:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 03cdd53cd9a1b78e015e9d01439a2b83 SHA-1: 4b175df88d4aa4fe140dc52204caeb21acee98e4 SHA-256: bc1bfa1e3a9afc71549db3c14a7f4389cee2657b2966d2489655485e98b09ff6
164 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=words+on+m PDF link annotation
    • https://www.meditech.cz/ckfinder/userfiles/files/tonuras.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/mepinizufalavasitodo.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/22323739091.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/kizokaka.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/bevezetulokidafudaje.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021092917022773499.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/museviwobezoto.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/tekawodusale.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/5aa9e3c9182e117996963abf40160d41/30119036402.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/48807004676.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/49914280967.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/zazusitof.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/75615339384.pdfIn PDF document text
    • http://stevis.cz/files/file/sokile.pdfIn PDF document text
    • https://what.whatproperty.ng/ckfinder/userfiles/files/kabebifu.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b2cfd4a3b---muduwivanozililoze.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210905131503_tgtfso.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/80509386743.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/jawatiwuzadapopoxef.pdfIn PDF document text
    • https://sino-islam.com/upload/file/220729331741.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210907041105165071ccccnv.pdfIn PDF document text
    • http://netflor.pl/upload/File/dugasajezet.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/kolipukupusedakedideno.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345459d8ef1---fodibafavugudabaxel.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_off0000af77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78D 9872 bytes
SHA-256: e0b29a3ea847c5a5b4efec7270df81301ef480199a98817c603870ef9085d912
font_02_sfnt_off0000dd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2A 16432 bytes
SHA-256: 5efb4135710732b4601c696181e74264a79a6d7de6d9af8f08396d8f892c5ff5

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