Malicious PDF — malware analysis report

Static analysis result for SHA-256 3950426f9cd38680…

MALICIOUS

PDF

82.0 KB Created: 2021-08-29 12:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00e208ee6b6ec480457df32067816efa SHA-1: 8a1b29b0ae3050138052104d3005e3e0707539a8 SHA-256: 3950426f9cd3868042833a9f8394defe8cbcf26a96e5d51108d15e98f718e32b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and a link farm pointing to compromised WordPress upload storage and other disposable hosting domains. The embedded JavaScript likely facilitates the download and execution of a second-stage payload, contributing to the phishing and trojan-like behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://graciaindoutama.com/kingkong/userfiles/files/jagurerituxifutukogif.pdf In PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1625169587.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610b45a0508ea---zesutodawogu.pdfIn PDF document text
    • http://derma-dts.de/files/file/komegunovodixofuzobif.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/cdd15015711293610a77462ba766b2b6/podanoves.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/3e89642d712fe5c6dd3321454074454a/bafake.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/jazuzewewozi.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/44176039074.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c370f07bc43---56250529077.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210606182953.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/3022240157.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/ed6db6367d5ad0a11dff4df04f7e4dea/84217364567.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/rudedudowonarulefodeme.pdfIn PDF document text
    • http://annabarons.lv/files/files/jufebetafexutu.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/verunezaxakoxuxap.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c3c473c83c4a2dfd91eaadabe9c6b33d/27792421666.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/4b47415fc82d4534334dcd665dee26e6/kanugimepixigarusisuj.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077fb7fe2dd5---zinedutanatukunokok.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8e5ce8fbe---54526390575.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/22801039701.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/81c195641232aa4b5f7fe428da0e2155/kikaguzugodozudijajuno.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/37391606692.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/zisux.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/db21ed67bce0a4ab58fe27f8a28c34d4/tarulalovikip.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210626205445_mcogtp.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15489476582.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093903f8d4e1---24705757564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=solved+question+paper+of+english+class+12PDF 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_off0000dc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC84 11456 bytes
SHA-256: 754e3bab9cbc515e5a61cf9e683aeeb78e9fff0f48a7f840d93b123afdc67ccb
font_01_sfnt_off0000f71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F30 16808 bytes
SHA-256: 1bb33b3013ef1cf7670dc7fc020f0643ccfec5c509e22bb7ef4c790527ff2234

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