Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc2ce64555591f1…

MALICIOUS

PDF

78.9 KB Created: 2021-09-21 03:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 68b448dc05f39b4cf36fab7e0b90790e SHA-1: 536349e7c910642c1d00c09bf221ed41158381f0 SHA-256: 5fc2ce64555591f158dab5ba702b2f12c1dbb89fc84a45b81dd763b9836f398a
172 Risk Score

Malware Insights

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

This PDF sample was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to multiple disposable hosts, suggesting it's designed to trick users into clicking links that likely lead to further malicious content or phishing pages. The presence of embedded JavaScript indicates potential for exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=best+android+pdf+viewer PDF link annotation
    • https://dcimx.com/files/43905245400.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/58211207566.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/gs7vmbpn6pp5vq11l2atjrhf3k/80279675242.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/f48156cbc596c37c6a68e7f2ddbb5675/94727439077.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/kufuxenenizasu.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614656dc8bbb9---39182985817.pdfIn PDF document text
    • https://congchung7.com/upload/file/nesezujarem.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/vodebugezidivaxu.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/mefulesolipogupolewarito.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/26624756895.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/1874254699.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/34364426102.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161319f5c74f91---65027620224.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/94738259286.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/26149536629.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/30317328964.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147f99848a07---94689109392.pdfIn PDF document text
    • http://vkts.se/userfiles/file/geseminokadanivik.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/liduledapakimugesireluj.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/wekedajumaridobor.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/81306785950.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/28076884019.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135b12d6d5a7---weduzopivegibukudezupo.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/48330250195.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_off0000d251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD251 16872 bytes
SHA-256: 6a6a5163ca565f829bf9bba76e93b9060b3f81ca09f97d0729965d01f1518248
font_01_sfnt_off0000fdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CB 10652 bytes
SHA-256: a68993ca58ded41f11855a636c6db830be984aec1226b2bc09375dbf6d58dd44

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