Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c6db3646ae3e2fa…

MALICIOUS

PDF

68.5 KB Created: 2021-09-27 17:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3ad5696d708d705df6a1eef9a28351e0 SHA-1: d56b8bf26036611b3035f949b0070ae74a07ebf8 SHA-256: 6c6db3646ae3e2fa6fb387f7bd673c480d5c441d5dfffaaab55dbcb248513945
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 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://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/6e26d2b31d4e96d3a9466b3f3ebf0af4/73253409291.pdf In PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/19681866455.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/7633a89701653c35cc8d906d7691abc7/7084899333.pdfIn PDF document text
    • http://surtek.biz/image/files/20150406_101143.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20219111529208870.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/wasovuvaxusevedofaguje.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e396516a4d---miwubeb.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/db189dfbda11adc0e515d7b4e6d4b3b1/65456582786.pdfIn PDF document text
    • https://activepymes.com/pub/file/75253272084.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146bc8d80358---58727362799.pdfIn PDF document text
    • http://yejida.com/userfiles/file/17334890237.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137c37090306---vigowidototolowusad.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/nukup.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/tuzejoxenogas.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/8605984220.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/gukosazekuna.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/tejareg.pdfIn PDF document text
    • http://www.520amis.com/upload/files/lupuvan.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/21373897616.pdfIn PDF document text
    • http://fruitsad.pl/images/file/55944078347.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/gukuvo.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/53664091858.pdfIn PDF document text
    • http://brain-sh.tw/upload/file/zabazajolukap.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/64814484507.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/34736305089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=topstore+download+apkPDF 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_off0000af94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF94 10432 bytes
SHA-256: ecd5e6d3220291946230786d699953a8c9439a7827dd2152aefecb71faab19e5
font_01_sfnt_off0000c772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC772 14752 bytes
SHA-256: a96932edc40bec6cce73c4c9cb6d18994ea6f7941492c51faa4a439878945f18
font_02_sfnt_off0000ec84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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