Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56ee435f4c6fd7c…

MALICIOUS

PDF

85.3 KB Created: 2021-09-21 15:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7b741ab5fda388e0a678fae7eefc4303 SHA-1: e422d25717d259c615bfbc0ea6b79e3759f1fc4e SHA-256: f56ee435f4c6fd7ccdbf0696199f03434b3f2937e8a0fe463bb90b5f315251bd
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous unknown URLs, many hosted on WordPress installations, suggests an attempt to distribute further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130329c6ac1f---33154538450.pdf In PDF document text
    • http://nepalbestcargo.com/userfiles/file/dimuxomibomikezulep.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/31305109410.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/levogewawidoxewufoguzu.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390d700bb55---89824349668.pdfIn PDF document text
    • https://sujatasfoodopolis.com/ckfinder/userfiles/files/27298754930.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/82700554353.pdfIn PDF document text
    • https://blogsma.com/files/88393737175.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/zafosajekejelomawisafog.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/fepijuzevajatekula.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/robiladuzamur.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/60661102005.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/b0c122c0925e93dad19450ac6318502a/88742421847.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/getedimebede.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/karudizofexaripuwebe.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a7b9c7c90---6718039704.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/10761582507.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/91180207848.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/61145289115.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/wuzabajabawuzu.pdfIn PDF document text
    • https://ottopianos.nl/files/noxozoxodob.pdfIn PDF document text
    • http://ipceurope.com/assets/file/fizereganirun.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/53154445311.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/030700378535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=twilight+saga+part+1+full+movie+downloadPDF 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_off0000e53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53E 11212 bytes
SHA-256: 52f2309b84587d82cadddb4c30d77d6f440684a6fd172663817627e7f102bbdc
font_01_sfnt_off0000ff40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11752 18420 bytes
SHA-256: 366657f6e0b7a152132ba8896b1033c02465aa55e9c22046455e9c545130b34a