Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef7cd7c8cf71a4c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 15:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6a211e9058aab08364f7787928b5eecc SHA-1: bb86b9c36a094bc293df76c8367fd75ba3544791 SHA-256: 5ef7cd7c8cf71a4c83f458732e049152399569e8f8936552eba297976a47ef8a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=last+man+on+earth+mod+apk PDF link annotation
    • https://habibitoursegypt.com/ckfinder/userfiles/files/vulimuxufivokigurupeje.pdfIn PDF document text
    • https://ibextrail.com/editor-images/tarivojujek.pdfIn PDF document text
    • http://inica.org/files/file///88642436884.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3fbc71bae---bibinijijobibademivigosi.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/reladapalekuvixade.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/sunegozuxedona.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/pibonomadizidafopali.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/22166577478.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/robesagamaxu.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/51467564896.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/69859952956.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/jodun.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/52918750817.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210916033709.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/10560561461395f264c6a5.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/46948025766.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614025c9950b3---64154384115.pdfIn PDF document text
    • http://bptramptour.pl/files/file/71434284400.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/4892719118.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/pbq0lerjesm5ta2rn6o8jfvptt/52011325730.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/mexivibe.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/59570204475.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/tigupeliroti.pdfIn PDF document text
    • https://kimcert.org/E/file/xugejapekidixumimup.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_off0000daf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF7 18644 bytes
SHA-256: 8a10b681c59e4b48aa00380fc2341e261c8850dde019f9e520c22365b694f1c7
font_01_sfnt_off00010bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CB 10568 bytes
SHA-256: d624226a1d768cb31ae3c0aacfd5de5a779c92692143ac39baf1bb449bc81545

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