Malicious PDF — malware analysis report

Static analysis result for SHA-256 445690bfdcab884e…

MALICIOUS

PDF

74.0 KB Created: 2021-09-16 08:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cc56c3c17cd73bc9307a86a7f6321b07 SHA-1: c31c60909aaad59b82e48ff522cc105ef727b235 SHA-256: 445690bfdcab884ed20272f30ddcdb5d3307eab04e6f2ed6e6b8922c8d5838ea
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick the user into downloading a secondary payload via the presented links or download button.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • 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://mzr-avocats.com/buddha/ckfinder/userfiles/files/16667855315.pdf In PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109080909383901.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/24769775930.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/78142467453.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/32772129569.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613450a3b0795---suwosululudemodefu.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/79682051256.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/48803373808.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/77559460039.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/13165112666.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f083d1c52e---sizovaboroxitanazera.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2869969a6---koduzesogarunadusixu.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/mujovuniwi.pdfIn PDF document text
    • https://wittnebel.dk/file/90033957620.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/jivawilebifulu.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/fikavajumakopabefemusu.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/7475246985.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/jawani.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/49570023473.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/piguzidunoxu.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4b974fbe5---3472609187.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/10003810302.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/95433552442.pdfIn PDF document text
    • https://anjingliar.com/contents/files/tujiserupuxenegowasakul.pdfIn PDF document text
    • http://modern-pro.ru/files/file/99425562929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=route+nl+androidPDF link annotation
    • 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_off0000be48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE48 17600 bytes
SHA-256: 109027e089d471b8f7cf1fbca69bad2d3d4398be42bfd00fd2c06dc4655785fd
font_01_sfnt_off0000eb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10361 10216 bytes
SHA-256: 1b20eaf8b8561617589aae7cf9f0f23acd25cf5006f7426208749d8bccaa0302

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