Malicious PDF — malware analysis report

Static analysis result for SHA-256 e367b9c85230f36e…

MALICIOUS

PDF

90.0 KB Created: 2021-08-02 00:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 059c106687af00a555a53157cffb6fb1 SHA-1: 288fead2238681af3bb1cdabb74f4914c596ce52 SHA-256: e367b9c85230f36e116aaab2161c0430710658c86ef932ac299a83a8407b6042
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and links to numerous compromised websites, some of which are hosted on disposable domains. The presence of a visual download button and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading a second-stage payload. The ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://krisoc.ru/uplcv?utm_term=download+pixel+gun+3d+mod+menu+apk PDF link annotation
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/9eb4548573eca0cf993b327d56de0953/xetafon.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/dalizozaxojug.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/naroluwago.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106301024.pdfIn PDF document text
    • http://capital96.com/userfiles/file/43723881830.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/88nktg0tnc5ebkro00k0tbo13p/zegimakesoxafutobetidov.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/df35608d83c46553a8d4b08fe52c352f/rezulagevunim.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/762355c98390e5b587a731ea1084d976/xebumawibogaralok.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/ibp9pio8mgsegk0i3r4pklt3a6/jikewinimokewa.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/2g3cb7i5rb3bcnu1eqssv8prsk/tefarexumipezarorefava.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d390a76c0b6---66012169926.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/xowizosas.pdfIn PDF document text
    • http://yilip.net/userData/board/file/nanazudidigowozajat.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6257cb869---22283003107.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/lopanut.pdfIn PDF document text
    • http://imaginove.eu/data/Files/sagotamipafabu.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/90692284110.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/80580943593.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/bakikibol.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/68399350540.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/zukom.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///202176915222644.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07E 10924 bytes
SHA-256: 0c90bd8a4cd7790a2072dffe9d6f1ee6fea689bfaf61b22f287df45b324b2640
font_01_sfnt_off0000f996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A8 18428 bytes
SHA-256: 82b6c182c2e79806671eb07a43c02fdb60d6c1e7415b345ee675742c0323a4c8
font_03_sfnt_off00014189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14189 16480 bytes
SHA-256: 7c932eaf255d732b95753d2296212fba9d20145396a73a6186ad9963fec8ab8f

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