Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7642027be580845…

MALICIOUS

PDF

71.4 KB Created: 2021-09-21 09:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c88b49b3df7fa7a348c5058af7613910 SHA-1: b84aa4aafed70b86c23f220ac3f8383075ae7cc2 SHA-256: a7642027be5808457e3ac3d64381715d576cafb8d14cb46e24441d22abca93be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://catamma.ru/uplcv?utm_term=hero+wars+defense+mod+apk PDF link annotation
    • https://inverpalmas.com/aym_image/files/42663678398.pdfIn PDF document text
    • http://charontrade.hu/data/file/8939875944.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/65479925196.pdfIn PDF document text
    • https://lapakunited.com/contents/files/765727293.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/gikekuvugijosudonosimumu.pdfIn PDF document text
    • http://fjsxsx558.com/upload/files/34450653131.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/jinosulibufezina.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/giwij.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/72168966659.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/gemani.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2a8c2cb61---kijelemovinizeveroje.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/ralegosabawudikajagefoka.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/36330296690.pdfIn PDF document text
    • https://vpmemorial.net/images/file/nugigoxozaxudebumiwele.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/jewiwekuninotonalisi.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/64988802901.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/livoviwigokoboximomokil.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/30ac37a1ad2d163659bd324ce4412f42/bijezowuxadubegavuvem.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/zexizejififefojudorijub.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/wexos.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161379d9584971---patoguzewipenuguwavev.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/dojekapo.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/84117559584.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_off0000b3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DF 17624 bytes
SHA-256: c820791e78f7d8e52f80bb449147f93bd0d3602485925d4373b51f9b811780c5
font_01_sfnt_off0000dfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA9 10592 bytes
SHA-256: 255f396ecdff9d496e9b0a23008a628d2d28006569e615f0001ce7e468c0a692
font_02_sfnt_off0000f7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.