Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f72d552e26bb12b…

MALICIOUS

PDF

88.4 KB Created: 2021-07-03 06:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9cb2c6a3465e073752cdb42f0b4ab6f9 SHA-1: 612dd5cdf8bebd9fb5eff17b153b98596f4fbbd0 SHA-256: 3f72d552e26bb12b1fc8db0d6736225dfe96e54d6b6e427075a6547cb5b3548b
196 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, specifically instructing the user to engage with a remote-support tool. This is strongly supported by the 'SE_REMOTE_SUPPORT_LURE' heuristic. The presence of numerous links to potentially compromised CMS upload directories and disposable hosting suggests an attempt to distribute malicious content or redirect users to malicious sites. While no scripts were explicitly extracted, the ML classifier and ClamAV detection indicate a high likelihood of malicious intent, possibly involving embedded exploits or obfuscated JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://ietc-oman.com/userfiles/files/benusagaxibolowamivarej.pdf In PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/jgduq04tibtjj88hb7597661h4/77861528878.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0c36cd229---monujubilanuxagunimijub.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/64435091509.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f3fca27cb---81142130758.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160717c7f040fe---tezaburigivewuludufunum.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/7d11a5895784ebf6fa105b20677bc9aa/43597643088.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/finifiwofonuwakupovibin.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///68288520853.pdfIn PDF document text
    • https://biocoils.com/img/file/disavate.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/mjgtak4hravd119qrpu8rjfng6/1483944540.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/ccc19ae89fba04bace9bffd690af5f8d/82017130520.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/ad4290cd92fcf45559b9015f69188dd2/4941247470.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/47fc3819261bc6acf04a2ff1161c1610/51544678345.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/13491756917.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d28e38d3e6d---roresijuruzore.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/1h4rki1ki28sln2b8mubpufnp6/96950217313.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/vasudidebediwilekilagew.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160873f9e56667---2348431183.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/6071818617.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160812da299719---salawojigusomimoluliwotip.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/21906827652.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/fpnjs5h3sfie1djm7nv0q0hkpo/73866290145.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c6b92e60---4251396835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=principles+of+thin+layer+chromatographyPDF 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_off0000f1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C2 18952 bytes
SHA-256: cc1db6f969ea1362087460265f16faf81f27eb78daaca744eb99be83f3a1c7e6
font_01_sfnt_off00012293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAA 11040 bytes
SHA-256: 81dad3fdb65978c897e3e934fbdd3649c483249949688c6fd51cefdc7a5f79ce

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