Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a213f2f747dec8…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 05:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e221044c4f2dacdcfec6e9edfabe065f SHA-1: 9adb2578123c9386b19d072b5b3e7d7ae23612cb SHA-256: 76a213f2f747dec8aab2d5b0ca71e8e34d24299d8bb4fb4dccbdd3f27c9524b4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress uploads and disposable domains, suggesting an attempt to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a spearphishing attachment designed to lead users to malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://coretry.ru/uplcv?utm_term=watch+op+episodes PDF link annotation
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146969ed8cad---mexezo.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/12635775049.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/zozasujikeda.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/nobufikaweve.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16140f8dec8a2f---59161944848.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/gasisitezabisajir.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613158d55f4b6---fovufa.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/sinegifukavawatiginijiwuf.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614e65e8cc716---92668803656.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/piwobopixopodilul.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/sekusedukijumelapamadel.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210918061019113.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/29684634784.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/retokuwodira.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/19498640928.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/bujosimutojanizukuval.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/javunudusob.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/javub.pdfIn PDF document text
    • http://lactopad.com/uploads/files/rawawesutomevinuzafutifu.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/femepofan.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/rarov.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/77665391407.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_off0000af56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF56 15496 bytes
SHA-256: 05c8df9ad1d00b65bc85dad1db267fdf95b0f3d6daad8b29481a574bee4cf066
font_01_sfnt_off0000d703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD703 10352 bytes
SHA-256: 63fe588478f2433345fb6ef38419072866d92084fd603118cdcc477b20e7cba2
font_02_sfnt_off0000ee9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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