Malicious PDF — malware analysis report

Static analysis result for SHA-256 221393a3980642ee…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 04:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e524bc6dfb5fb7f821f3d73a3797f534 SHA-1: b40582ab20d9db35d8f835697df09649ff214792 SHA-256: 221393a3980642eebbc23eb5cf634001415609b01d4ca4e99b220deba855fcd5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are used to distribute further payloads or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=phone+vili+apk PDF link annotation
    • https://lotteppta.net/beta/assets/file/31509932694.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/3701449877.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/jamabute.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/53424833472.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/fimipivitav.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8ab437fe9---18898837633.pdfIn PDF document text
    • http://iltorg.ru/upload/file/damatuj.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/20845189630.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210918_040557.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161314c3248041---kifinujen.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/49112087738.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/5a2dc78432f165033afb7b4be28a1418/73920636785.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/dazilemipuj.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/vifer.pdfIn PDF document text
    • http://hidramaco.com/files/files/37673837912.pdfIn PDF document text
    • https://websbag.com/uploads/files/1896521931.pdfIn PDF document text
    • https://projetovm.com/uploads/files/72498985544.pdfIn PDF document text
    • http://belean.pl/userfiles/file/puzogisanuxeva.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/34561507607.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/21174840818.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/91611002314.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141de75052dc---xitate.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/bokefozotob.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_off0000d582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD582 21636 bytes
SHA-256: d02f3ca816f18ea3c7df7ba0c1cb9e44f6bc404547a13916d1080a066b962fb5
font_01_sfnt_off00010d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12590 10140 bytes
SHA-256: 683698284082c8aa8b926314b85126c68ad03b27e2acbb7e1236b7557f8b66b2

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