Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccc5e9cf07377432…

MALICIOUS

PDF

96.6 KB Created: 2021-06-27 04:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: caf8df983acb60a20e962cb736014a93 SHA-1: e441d203b42eab94ef30d5deccfbe981d7dd108c SHA-256: ccc5e9cf07377432311933472bca545bed8e4bebe657ee83d93eaeadbacbd00f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript, though not fully detailed, further supports the malicious intent of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=where+is+area+code+912+coming+from PDF link annotation
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/1a753f727d7aa583d9afab8895044e98/40835953940.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/cfehr99t0tr6ni7ic73hoi0dk3/14864134819.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/98450228698.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/65e217ba1e9dcdf3f71f7246ce53cc2a/bopoporek.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083048263116---nagedabalusudonosojogab.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/2d9ksvkuahjfu5df38n74unirv/60788342433.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ulhnd0d7q0alpi50qns5sm6fqs/59022714515.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/21584157487.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/deguramuxibokujebiriz.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5de499a0b---niruxovejadofijevozarosen.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a632879cb93---19713388510.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/dc921b32917ce489231d21cd8e3a8c43/20841755854.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/785cdf81dc4da627033eb9ec4f090bba/lavigalalafumo.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/rolopuwumivujasewobuk.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b64881d74---sofusimole.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9b9db939d---wamafogutubi.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aad48cec4c---porokesuzoxofijononodot.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/99383569917.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/popekedebajimapukefow.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vd3co4ltipt0ur7rsn4qhhue00/38462773785.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/699c30db3b21500cee644dad40041d35/84554938225.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/66128472742.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca29882158---99992204047.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/tuvaxezufonamevovajije.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/04517707fb38ea22a2bf55d5a45fc1bf/56838017086.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/baxovaruwexajanilufiluju.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_off00011555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11555 17744 bytes
SHA-256: 828a6989a10edbfb5b2b1f6b1d4a8cd25ff4f3e3f7d07e334e3207586eb60318
font_01_sfnt_off000142ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B16 11112 bytes
SHA-256: 041b69f2bba88b4ef631bff642ca5afacd988a498fa405b6ce966342b498fda9